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Five MIT faculty members named 2023 Simons Investigators | MIT … – MIT News

Five MIT professors have been selected to receive the 2023 Simons Investigators awards from the Simons Foundation. Virginia Vassilevska Williams and Vinod Vaikuntanathan are both professors in MITs Department of Electrical Engineering and Computer Science (EECS) and principal investigators in MITs Computer Science and Artificial Intelligence Laboratory (CSAIL). Aram Harrow and Leonid Mirny are professors in the Department of Physics, and Davesh Maulik is a professor in the Department of Mathematics.

The Simons Investigator program supports outstanding theoretical scientists who receive a stable base of research support from the foundation, enabling them to undertake the long-term study of fundamental questions.

Aram Harrow '01, PhD '05, professor of physics, studies theoretical quantum information science in order to understand the capabilities of quantum computers and quantum communication devices. Harrow has developed quantum algorithms for solving large systems of linear equations and hybrid classical-quantum algorithms for machine learning, and has also contributed to the intersection of quantum information and many-body physics, with work on thermalization, random quantum dynamics, and the monogamy property of quantum entanglement. He was a lecturer at the University of Bristol and a research assistant professor at the University of Washington until joining MIT in 2013. His awards include the NSF CAREER award, several best paper awards, an APS Outstanding Referee Award, and the APS Rolf Landauer and Charles H Bennett Award in Quantum Computing.

Davesh Maulik joined the Department of Mathematics at MIT in 2015. He works in algebraic geometry, with an emphasis on the geometry of moduli spaces. In many cases, this involves using ideas from neighboring fields such as representation theory, symplectic geometry, and number theory. His most recent work has focused on moduli spaces of Higgs bundles and various conjectures regarding their structure. In the past, he has received a Clay Mathematics Research Fellowship and the Compositio Mathematica Prize with coauthors for an outstanding research publication.

Leonid Mirny, the Richard J. Cohen (1976) Professor in Medicine and Biomedical Physics, is a core faculty member at the Institute for Medical Engineering and Science (IMES), and is faculty at the Department of Physics. His work combines biophysical modeling with analysis of large genomics data to address fundamental problems in biology. Mirny aims to understand how exceedingly long molecules of DNA are folded in 3D, and how this 3D folding of the genome influences gene expression and execution of genetic programs in health and disease. His prediction that the genome is folded by a new class of motors that act by loop extrusion was experimentally confirmed, leading a paradigm shift in chromosome biology. Broadly, Mirny is interested in unraveling physical mechanisms that underlie reading, writing, and transmission of genetic and epigenetic information. He was awarded the 2019 Blaise Pascal International Chair of Excellence and was named a Fellow of the American Physical Society. He received his MS in chemistry from the Weizmann Institute of Science, and his PhD in biophysics from Harvard University, where he also served as a junior fellow at Harvard Society of Fellows.

Vinod Vaikuntanathan is a professor of computer science at MIT. The co-inventor of modern fully homomorphic encryption systems and many other lattice-based (and post-quantum secure) cryptographic primitives, Vaikuntanathans work has been recognized with a George M. Sprowls PhD thesis award, an IBM Josef Raviv Fellowship, a Sloan Faculty Fellowship, a Microsoft Faculty Fellowship, an NSF CAREER Award, a DARPA Young Faculty Award, a Harold E. Edgerton Faculty Award, Test of Time awards from IEEE FOCS and CRYPTO conferences, and a Gdel prize. Vaikuntanathan earned his SM and PhD degrees from MIT, and a BTech degree from the Indian Institute of Technology Madras.

Virginia Vassilevska Williams is a professor of computer science at MIT EECS. Williamss research focuses on algorithm design and analysis of fundamental problems involving graphs, matrices and more, seeking to determine the precise (asymptotic) time complexity of these problems. She has designed the fastest algorithm for matrix multiplication and is widely regarded as the leading expert on fine-grained complexity. Among her many awards, she has received an NSF CAREER award; a Sloan Research Fellowship; a Google Faculty Research Award, a Thornton Family Faculty Research Innovation Fellowship (FRIF), and was an invited speaker at the International Congress of Mathematicians in 2018. Williams earned her MS and PhD degrees at Carnegie Mellon University, and her BS degree at Caltech.

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She got famous on YouTube. Now it helps fund her research in … – NPR

Theoretical physicist and YouTuber Sabine Hossenfelder, shown in a photo taken in December at the University of Oxford in England, turned to YouTube "to keep my sanity" during the dark days of the pandemic. Anthony Sajdler hide caption

Theoretical physicist and YouTuber Sabine Hossenfelder, shown in a photo taken in December at the University of Oxford in England, turned to YouTube "to keep my sanity" during the dark days of the pandemic.

The dark days of the COVID-19 pandemic helped transform Sabine Hossenfelder into an unlikely social media star. In the process, she has raised a few eyebrows among her fellow scientists. She's also made an important discovery that just might bode well for her future research.

Hossenfelder turned to YouTube "to keep my sanity" when she was unable to go to her office at Germany's Frankfurt Institute for Advanced Studies. Actually, you might say she returned. She'd started a channel in 2007 but just hadn't been very active. Then came a rebranding Science without the gobbledygook. Today, she has 1 million subscribers (up from 50,000) and also enjoys a strong and growing contingent of Patreon supporters.

Several times a month, the theoretical physicist and mathematician drops a new video, dispensing her dry wit and pithy wisdom to a loyal fan base of nerds across the internet.

She takes her role as a science communicator seriously, aiming her videos at an audience seeking context. "People can go to my channel and get the brief, 20-minute summary," Hossenfelder says. "They don't have to read a whole book or download a review article, which they won't understand anyway."

Her channel stakes out the no-man's land between gee-whiz science and the heavyweight journals. From her experience as a freelance writer, Hossenfelder says she "knew full-well that there were stories you just can't get by an editor, not because they're wrong, but because they have no timely hook." She aims to fill that gap.

It all comes packaged with a spoonful of humor to help the science go down:

Are we all living in a computer simulation? "I quite like the idea ... it gives me hope that things will be better on the next level," she says.

Why does 5G technology use high frequencies? "There's a reason they haven't been previously used for telecommunication, and it's not because millimeter waves are also used as goodbyes for in-laws."

As her YouTube channel has gained traction, Hossenfelder has been able to hire a handful of writers, though she still writes most of her own jokes. She's no longer at the Frankfurt Institute but has a research position at the Munich Center for Mathematical Philosophy. Meanwhile, her dive into social media has allowed her to largely escape the perpetual pursuit of research grants that she says is "always kind of like a lottery."

Posting videos to the internet, it turns out, generates a more reliable revenue stream to fund her work in quantum gravity. YouTube provides some money directly, but Hossenfelder gets more through sponsors who advertise on her channel, Patreon supporters and donations. Crunching the numbers, she "realized that so long as I would keep producing interesting content, I would have an income."

Hossenfelder's science channel has also become a ready platform for her somewhat contrarian views on the state of physics. Among them is what she sees as the problem of beauty, the pursuit of simplicity. Specifically, how her colleagues who try to fathom the fundamental underpinnings of the universe are obsessed with it.

As far back as the Renaissance, scientists have sought compact and elegant descriptions of space, time and motion: a sort of scientific version of Occam's razor that the simplest explanation tends to be the correct one. But as we seek answers in a complex universe, Hossenfelder cautions that the quest for simplicity could be a dead end. Her 2018 book on the topic, Lost in Math: How Beauty Leads Physics Astray, served as something of a shot across the bow of modern physics.

Fellow physicists, she contends, "have come up with very narrow notions of beauty, which they derived from things that worked in the past."

"It's all well and fine. It's worth a try," she says. "But now they've gotten stuck on it. This is why you see so many ideas that fail over and over again."

Sabine Hossenfelder via YouTube

In her mind, one such failure has been the effort to explain dark matter, the so-far undetected and unexplained something that makes up a large percentage of the universe. "At the point where we are now, it's pretty clear that it can't be a simple story. It's got to be something more complicated than some kind of new particle," she says.

To be sure, Hossenfelder, 47, isn't the only physicist wondering aloud how far the standard model of particle physics can be pushed in the service of dark matter. She describes herself as "pretty much a voice in the wilderness," but some others, such as astrophysicist Pavel Kroupa, have publicly expressed similar skepticism.

Patricia Rankin, who chairs the department of physics at Arizona State University, says that while she doesn't entirely agree with Hossenfelder's views on physics, "I'm definitely in sympathy with a lot of what she says about it being important to actually delineate what science can and can't tell us." She praises Hossenfelder for "[challenging] people's assumptions ... because that's really what science is all about."

Stacy McGaugh, a professor of astronomy at Case Western Reserve University, met Hossenfelder at a conference several years ago, where they were both on the roster of speakers. They discovered a shared view on many issues, including that the gaping hole in physics left by dark matter might be at least partially filled by a modified theory of gravity. The two have since collaborated on multiple scientific papers. "She's very frank and plainspoken and is not afraid to speak her mind. And that's great," McGaugh says.

That frankness has placed her at odds with some big guns of science, including Don Lincoln, a physicist and researcher at the Fermi National Accelerator Laboratory (Fermilab) outside of Chicago. Unlike Hossenfelder, his work is focused on the experimental side of cutting-edge physics. Lincoln, a fixture on Fermilab's YouTube channel, co-discovered the top quark in 1995 and was part of the team in 2012 that discovered the Higgs boson at Europe's Large Hadron Collider. He and Hossenfelder have occasionally sparred online, he says.

"It's not like we are mortal enemies or anything like that," he's careful to point out. But in a recent episode of Science without the gobbledygook, Hossenfelder took experimental scientists to task for their pursuit of ever-larger, more-powerful and expensive colliders that she believes have little prospect of making important new discoveries.

Lincoln, however, says there are good reasons to believe that dark matter will turn out to be previously unseen particles and not some modified form of gravity. "Most cosmologists would say that while it's true that these modified motion and modified gravity theories can be made to work pretty well on the size of rotating galaxies, or the size of clusters of galaxies, where they fail is on the truly cosmic scale," he says.

Sabine Hossenfelder via YouTube

Hossenfelder has also staked out a number of contentious and not-so-contentious positions through her writings and more than 300 YouTube videos:

Artificial intelligence? "It's going to make a lot of things much more consumer friendly. And mostly I think it's a good thing."

Climate change? "I don't think it's an existential threat. Not by itself, but it's a threat multiplier."

Hossenfelder also "totally believes" in extraterrestrial intelligence. "I would say abundant in the universe. But abundant in our galaxy? I don't know."

On a parallel track to her science channel, Hossenfelder has produced an eclectic mix of music videos, ranging from Beethoven's Ode to Joy to a cover of "Galaxy Song" from the 1983 Monty Python film The Meaning of Life. She learned most of it at YouTube University. "I am mostly interested in audio mixing. I have a thing for quirky sound effects and synths and echoes and reverb and all kinds of distortions," she says.

Juggling the roles of scientist and content creator with her personal life she lives with her husband and has twin daughters in their early teens can be a bit overwhelming, she acknowledges. Besides YouTube, she's on Substack and also hosts a podcast. "If I had the time, I would probably be on TikTok, but at the moment I just can't do it," Hossenfelder says.

It's more acceptable nowadays to be both a scientist and someone who explains science to the public, she says. Giants such as the late Carl Sagan and, more recently, Neil deGrasse Tyson have helped pave the way. But among her fellow scientists, "there's still this line of thought that Sabine is not doing research anymore ... that she's now doing YouTube," Hossenfelder says.

"Basically I don't care. I do my thing," she says.

McGaugh, Hossenfelder's collaborator and co-author, expresses concern that her heavy commitment to social media might inevitably crowd out her research. "I can see the pressures," he admits. "But Sabine so far has managed to do both."

Arizona State's Rankin says Hossenfelder's efforts to fund her own research, while unusual today, hark back to an era when gentlemen scientists put up their own money to build scientific instruments, such as telescopes, and pay for scientific expeditions. "But then ... it was like you just couldn't afford to do science unless you were funded through a federal government," Rankin says.

It remains to be seen whether others follow Hossenfelder's lead. Regardless, she's continuing to build her brand with plans to add quizzes to go with the YouTube videos that she hopes will "help with understanding the material."

Last year, she published her second book, Existential Physics: A Scientist's Guide to Life's Biggest Questions. And she's working on two new scientific papers.

While the gender divide in physics is marginally less stark in Germany than in America by one estimate, a quarter of Ph.D.s in physics are women there, while it's only about a fifth in the U.S. Hossenfelder eschews the "role model" label.

"I'm a sarcastic, annoying, permanently grumpy middle-aged woman, and no one in their right mind should strive to be anything like me," she says.

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UMD Celebrates Grand Opening of Quantum Computing Research … – Maryland Today

The University of Maryland on Tuesday announced the grand opening of the National Quantum Laboratory (QLab), a groundbreaking quantum research center developed in partnership with College Park-based IonQ, a leader in the quantum computing industry. The QLab enables people from across the nation and around the world to work with one of the worlds most powerful quantum computers alongside leading experts in the field in efforts to address some of the most complex challenges of our time.

Located at the companys headquarters off College Avenue in UMDs Discovery District, this cutting-edge workspace aims to build the next generation of quantum talent and innovations and further establish the region as the Capital of Quantum.

U.S. Sen. Ben Cardin of Maryland told attendees that the university-company partnership is a step toward building quantum computing as a necessary societal tool.

This is important for Maryland and the University of Maryland, but what youre doing here today is critically important to Americas future and quite frankly, the global future, Cardin said.

Thanks to a nearly $20 million UMD investment that fueled the facilitys opening, researchers, students, industry leaders, entrepreneurs and others are already taking advantage of the QLab collaboration to explore how quantum computers can help improve machine learning and AI, materials discovery, supply chain logistics, climate modeling, cybersecurity and more.

As a node in the Mid-Atlantic Regional Quantum Internet, the QLab is also accelerating the development of quantum networking capabilities necessary to realize the full potential of quantum computers, sensors and communications systems. QLab also supports the growth of a skilled quantum workforce and has hosted more than 300 participants in virtual and in-person workshops and bootcamps.

We cannot fully imagine where quantum computing will take us in the future, but we do know the collaborations made possible through QLab will be essential to moving the field forward and reaching the life-altering discoveries we seek, said UMD President Darryll J. Pines. QLab spikes our competitiveness factor for the state and our region as we attract innovators from all over the world to work with us and share resources.

UMD is one of the worlds leading institutions of quantum science and engineering, working in close partnership with the National Institute of Standards and Technology as well as other federal agencies and labs. The university boasts more than 200 quantum researchers, eight quantum-focused centers and a comprehensive suite of quantum education offerings.

This first-of-its-kind QLab builds upon the universitys $300 million investment in quantum science and more than 30-year track record of driving advances in quantum physics and technology. It additionally marks the latest extension of the universitys partnership with IonQ, a company partially founded on research conducted at UMD.

At IonQ, we firmly believe that the future of quantum relies on a strong partnership between industry and academia. QLab is a testament of our commitment to nurturing this collaboration, paving the way for students to be at the forefront of quantum research and development, said Peter Chapman, CEO and president of IonQ. Through our own journey from a research-oriented approach to our current focus on engineering and manufacturing, we aim to achieve an advanced quantum system in the near future that will deliver significant advantages over classical computing for certain use cases.

The QLab builds on impact-focused regional collaborations enabled by the Mid-Atlantic Quantum Alliance and its 38 members from academia, industry and government.

Among the guests were high-ranking state lawmakers and officials, including Maryland Senate President Bill Ferguson and Lt. Gov. Aruna Miller.

As an engineer, I am geeking out right now, Miller said. Gov. (Wes) Moore and I believe quantum is one of the biggest opportunities we have as a state to grow, and we are excited to move into this frontier with the best and the brightest."

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Researcher talks space-time structures alongside Nobel laureate … – Xi’an Jiaotong-Liverpool University

Its not very often that you meet your heroes, let alone give a seminar in the same series as them.

Thats what happened to Dr Niels Gresnigt, Associate Professor at XJTLUs Department of Physics. Dr Gresnigt was invited to give a lecture and be an advisor for the online lecture series Octonions, Standard Model, and Unification (OSMU23).

The seminars, occurring fortnightly between February and December 2023, feature ongoing research from eminent physicists and mathematicians working on space-time structures in quantum theory.

As if giving a talk was not nerve-wracking enough, Dr Gresnigts audience included some of the most extraordinary minds in the world of science, including Professor Sir Roger Penrose, who also gave the opening seminar of the series.

Over the course of his career, Professor Penrose has won several of the most prestigious prizes in physics, including the 2020 Nobel Prize in physics and the 1988 Wolf Prize, which he shared with Stephen Hawking.

Other well-known physicists will also deliver lectures in the series, including Professors Basil Hiley, Albert Schwarz, Robert Arnott Wilson, and Geoffrey Dixon.

The speakers at each seminar focus on the physics and mathematics that describe the different elementary particles that make up our universe and their possible interactions.

The standard model of particle physics explains how elementary particles interact through strong, weak, and electromagnetic forces. Although it does a wonderful job of predicting the outcomes of experiments, some theoretical questions remain unanswered.

To answer these concerns, recent research has suggested adopting a particular type of number system called a division algebra. The largest of these number systems, known as the octonions, is one of only four found in nature, says Dr Gresnigt.

Octonions a number system that may hold the key to understanding the laws of nature

During Dr Gresnigts talk, he outlined some ideas of how they might mathematically describe the behaviour of particles within the algebraic framework of the division algebras.

He also discussed a curious association between these algebraic models and a topological description of particles in terms of simple braids: sets of parallel strings that are intertwined in a specific way.

Braids sets of parallel strings that are intertwined in a specific way

This series has brought together over 20 physicists and mathematicians, and Dr Gresnigt says he has already built collaborations and connections with other speakers in this series.

He says: A number of physicists and mathematicians around the world focus on using octonions and the other division algebras to understand why we observe the particles that we do and to explain their behaviour.

Consequently, this seminar series provides a chance for us to exchange ideas, collaborate on research projects, and move forward.

The idea that division algebras may underlie the rules of nature is what inspired the current lecture series.

Dr Niels Gresnigt delivering his online lecture

OSMU23 was presented by the Archive Trust for Research in Mathematical Sciences and Philosophy (Oxford) and the Inter-University Centre for Astronomy and Astrophysics (Pune).

Dr Niels Gresnigt joined XJTLU in August 2014. His research interests include theoretical high energy physics and loop quantum gravity.

His recent study is Braided matter interactions in quantum gravity via one-handle attachment. Clickhereto read it.

By Qinru Liu

Edited by Catherine Diamond and Patricia Pieterse

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Research Fellow in Quantum Learning and/or Optimisation Theory … – Times Higher Education

About the Centre for Quantum Technologies

(CQT) The Centre for Quantum Technologies (CQT) is a research centre of excellence in Singapore. It brings together physicists, computer scientists and engineers to do basic research on quantum physics and to build devices based on quantum phenomena. Experts in this new discipline of quantum technologies are applying their discoveries in computing, communications, and sensing. CQT is hosted by the National University of Singapore and also has staff at Nanyang Technological University. With some 180 researchers and students, it offers a friendly and international work environment. Learn more about CQT atwww.quantumlah.org

Job Description

You will perform research in quantum information theory, in particular on topics in learning and/or optimisation theory; You will be working in an internationally competitive group, and will have the opportunity to work with highly motivated students; You will have access to funds covering your travel expenses to conferences and/or research visits Positions are available immediately.

Job Requirements

More Information

Please include your consent by filling in theNUS Personal Data Consentfor Job Applicants.Applications should contain your latest CV and a description of your research interests.

Salary will be competitive and will commensurate with the candidate's work experience.

Location: [[Kent Ridge]]Department: [[Centre for Quantum Technologies]]Job requisition ID: [[22108]]

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Schrodinger Control Optimal Planning for Goal-Based Wealth … – Rebellion Research

Schrodinger Control Optimal Planning for Goal-Based Wealth Management

Science

Erwin Schrdinger. Nobel foundationhttp://nobelprize.org/nobel_prizes/physics/laureates/1933/schrodinger-

Is the wealth management problem a quantum control problem in disguise?

Leaving jokes aside, I believe that the answer to this question becomes affirmative in a very precise sense encoded in the word disguise, which means here mathematically equivalent. Though establishing this equivalence was not specifically my initial objective, this is a by-product of my latest research that I am very happy to share here.

Erwin Schrdinger as a young man

More specifically, the new paper shows that the framework of quantum mechanics. Furthermore, more specifically of quantum optimal control.

Schrdinger equation

Moreover, the exact mathematical framework where the problem of optimal retirement planning can be solved in the most tractable way. As quantum control can be very naturally (at least in theory) implemented with quantum computers, potential applications of quantum computing to wealth management modeling can be a very interesting venue for future research.

This paper addresses a problem routinely solved (or at least supposed to be routinely solved) by millions of working individuals who participate in retirement saving plans such as the 401(K) plans in the US, or similar programs worldwide. The problem is to plan an optimal contribution schedule to their investment portfolio so that their wealth by the time of retirement will be above a certain target wealth level at a certain probability confidence level.

Newtons laws of motion, combined with his law of gravity, allow the prediction of howplanets,moons, and other objects orbit through theSolar System, and they are a vital part of planningspace travel. During the 1968Apollo 8mission, astronautBill Anderstook this photo,Earthrise; on their way back to Earth, Anders remarked, I thinkIsaac Newtonis doing most of the driving right now.[1]

NASA/Bill Andershttp://www.hq.nasa.gov/office/pao/History/alsj/a410/AS8-14-2383HR.jpg

Unlike the passive dynamics problem of the conventional quantum mechanics, in tasks of quantum control, the objective is to control the Schrodinger potential in order to bring a quantum system into a desired terminal state at a smallest cost or in a shortest time. In the same way, here we control the degree of non-linearity of the Morse potential and the initial particle position in order to achieve a desired quantum mechanical terminal state.

In this sense, the statement in the title now reads:

The wealth management problem is a quantum optimal control problem in disguise.

Dr. Igor Halperin

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All objects and some questions | American Journal of Physics – American Institute of Physics

In Fig. 2, we plot all the composite objects in the Universe: protons, atoms, life forms, asteroids, moons, planets, stars, galaxies, galaxy clusters, giant voids, and the Universe itself. Humans are represented by a mass of 70kg and a radius of 50cm (we assume sphericity), while whales are represented by a mass of 105kg and a radius of 7 m. Objects with uniform density are described by m r 3. Thus, in a log(m)log(r) plot such as Fig. 2, all objects of the same density fall along the same isodensity line of slope 3. For example, atoms and objects made of atoms, such as life on Earth (viruses, bacteria, fleas, humans, and whales) asteroids, moons, planets, and main sequence stars, lie close to the atomic density line atomic water = 1 gm / cm 3. At the top of the plot, this line is labeled atomic 10 3 s, because objects along this isodensity line have the density of water, and because the entire Universe had this density at the end of Big Bang Nucleosynthesis, 10 3 s after the big bang. Protons, neutrons, and neutron stars are found along the slope = 3, nuclear density line which is 14 orders of magnitude more dense than anything made of atoms: nuclear / atomic 10 14. It is labeled nuclear 10 6 s because the entire Universe was at this nuclear density a millionth of a second after the big bang.

The largest objects in the upper right are super-clusters of galaxies with densities approximately 20% larger than the current matter density of the Universe. For completeness, we have also plotted the largest known voids. The current matter density is the longest diagonal isodensity line on the right labeled at the top now 10 17 s). This density is the value in Fig. 1 of the black ( r + m) line at t=now.

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World-leading quantum computer will give USask ‘Quantum Boost’ – USask News

This is a really exciting moment in quantum science and quantum innovation, said Dr. Steven Rayan (PhD), professor in USasks College of Arts and Sciences Department of Mathematics and Statistics. The machine being unveiled [today] is one of the fastest and most powerful quantum computers in the world Its an incredible engineering feat ... and its here on Canadian soil.

Rayan, who is also the director of USasks Centre for Quantum Topology and its Applications (quanTA), and lead of USasks Quantum Innovation Signature Area of Research, joined government representatives, industry leaders and researchers from across U15 universities in Bromont, Que., for the inauguration event on Sept. 22, 2023. Having worked closely with IBM Canada and PINQ to envision and expand the use applications for Quantum System One in institutional and industrial settings across Canada, Rayan is now championing a quantum boost to existing and future RSAW at USask.

While affordable and widely accessible, traditional computing relies on a binary bit system that limits its capacity to effectively manage highly complex data sets and models. By contrast, quantum computing systems use qubits elements that embrace the principles of quantum physics and entanglement to exist in multiple states at the same time. As a result, these highly specialized systems can compute extremely complicated data sets and produce predictive models in ways more profound than the computer you are currently reading this on.

Though Quantum System One itself is stationed in Quebec, Rayan noted that emerging partnerships and USasks strong relationships with both IBM Canada and PINQ will allow use of the new quantum computer by faculty, staff and students across the university. Researchers can design quantum programs, get data in a quantum-ready state, open a remote session with Quantum System One, then use and interpret the data in-house. This ground-breaking direct access model reflects an exciting leap forward for the wider deployment of quantum technologies.

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Exploring the relationship between thermalization dynamics and quantum criticality in lattice gauge theories – Phys.org

This article has been reviewed according to ScienceX's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility:

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Researchers from the University of Science and Technology of China(USTC) of the Chinese Academy of Sciences (CAS) have developed an ultra-cold atom quantum simulator to study the relationship between the non-equilibrium thermalization process and quantum criticality in lattice gauge field theories. The research was led by Pan Jianwei and Yuan Zhensheng, in collaboration with Zhai Hui from Tsinghua University and Yao Zhiyuan from Lanzhou University.

Their findings reveal that multi-body systems possessing gauge symmetry tend to thermalize to an equilibrium state more easily when situated in a quantum phase transition critical region. The results were published in Physical Review Letters.

Gauge theory and statistical mechanics are two foundational theories of physics. From the Maxwell's equations of classical electromagnetism to quantum electrodynamics and the Standard Model, which describe the interactions of fundamental particles, all adhere to specific gauge symmetries. On the other hand, statistical mechanics connects the microscopic states of large ensembles of particles (such as atoms and molecules) to their macroscopic statistical behaviors, based on the principle of maximum entropy proposed by Boltzmann and others. It elucidates, for instance, how the energy distribution of microscopic particles affects macroscopic quantities like pressure, volume, or temperature.

So, does a quantum many-body system described by gauge theory thermalize to a thermodynamic equilibrium when it's far from equilibrium? Answering this question would advance our understanding of gauge theory, statistical mechanics, and their interrelation. While theoretical physicists have proposed various models to analyze this issue, it remains experimentally challenging to construct a physical system that is both described by gauge theory and that can be artificially manipulated and observed during its thermalization process.

The emergence of ultracold atomic quantum simulators has provided an ideal experimental platform for studying gauge theories and statistical physics concurrently. In 2020, a research team from USTC developed an ultracold atomic optical lattice quantum simulator with 71 lattice points. This marked the first experimental simulation of the quantum phase transition process in the U(1) lattice gauge theory, specifically the Schwinger Model.

In 2022, the team simulated the thermalization dynamics of transitioning from a non-equilibrium to an equilibrium state in lattice gauge field theories. For the first time experimentally, they verified the "loss" of initial state information due to quantum many-body thermalization under gauge symmetry constraints.

Collaborators on this project, Zhai Hui and Yao Zhiyuan, have pointed out through theoretical research that there exists a correlation between quantum thermalization and quantum phase transitions in such lattice gauge models. Starting from the antiferromagnetic Neel state, they predicted that the system can achieve full thermalization only in the vicinity of the quantum phase transition point.

Observing the relationship between quantum thermalization and quantum phase transitions in lattice gauge theories poses new challenges to previous experimental capabilities: the challenge lies in how to control and detect many-body quantum states in situ with single lattice point precision and distinguishable atomic numbers.

On the foundation of their ultracold atomic quantum simulator, the team has combined techniques including quantum gas microscopy, spin-dependent superlattices, and programmable optical potentials. This amalgamation has paved the way for the development of atomic operations and detection techniques with single-site precision and distinguishable particle numbers.

Leveraging these advancements, the researchers were able to prepare and probe multi-atomic quantum states with any atomic configuration. Moreover, they tracked the dynamical evolution of many-body quantum states under the constraints of gauge symmetry.

In their study, the team experimentally prepared initial states with specific atomic configurations. They utilized the method of adiabatic evolution to investigate the quantum phase transition process under gauge symmetry constraints. For the first time in experimental conditions, they accurately pinpointed the phase transition point through finite-size scaling theory.

In addition, they explored the annealing dynamics of the same initial configuration when far from equilibrium. Their work unveiled a pattern wherein many-body systems with gauge symmetry, when near the quantum phase transition critical point, tend to thermally stabilize into an equilibrium state.

The journal Physics highlighted their achievements in an article titled "Watching a Quantum System Thermalize."

More information: Han-Yi Wang et al, Interrelated Thermalization and Quantum Criticality in a Lattice Gauge Simulator, Physical Review Letters (2023). DOI: 10.1103/PhysRevLett.131.050401

Charles Day, Watching a Quantum System Thermalize, Physics (2023). DOI: 10.1103/Physics.16.s115

Journal information: Physical Review Letters

Provided by University of Science and Technology of China

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Michigan Tech Research Award Winner Pursues Discovery of … – Michigan Technological University

An internationally recognized expert in high-energy gamma-ray astronomy and galactic cosmic rays, Petra Huentemeyer serves as a vice-spokesperson for a globally collaborative observatory and mentors her students to seek their own bright futures. The experimental astrophysicist and distinguished professor of physics is the 2023 recipient of the Michigan Technological University Research Award.

Huentemeyer views the career path she has followed as a natural if not always easy progression. Fueled by a persistent curiosity to probe the unknown origins of the universe, her work has led her to study and conduct research at the worlds leading institutions in her field.

The researcher, who enjoys watching movies in her leisure time, said summer 2023s blockbuster biopic Oppenheimer sparked reflections on how she chose her discipline. In the context of Oppenheimer, I thought about how I actually started in the field of physics coming out of high school, she said. I grew up in the Cold War era. In 1991 I was watching a German miniseries, called the End of Innocence, about the competition with the Manhattan Project and the work of Otto Hahn.

Hahn won the Nobel Prize for chemistry in 1944 and is credited as the father of nuclear fission.For more than 30 years he worked with Lise Meitner a figure only briefly touched on in the TV program who nonetheless made an impression on a teenage Huentemeyer. She was one of the first women in physics to earn a Ph.D. There were a lot of people who thought she should have also gotten the award, said Huentemeyer. I was like, Wow, this is interesting. This was really impactful on society. That was a tipping point. I knew that I wanted to try physics, even though it was a little daunting.

As the director of Michigan Techs Earth, Planetary, and Space Sciences Institute, Huentemeyer helped to found and is the former U.S. spokesperson for the High Altitude Water Cherenkov (HAWC) gamma-ray observatory near Puebla, Mexico. She is vice-spokesperson for the multinational Southern Wide-field Gamma-ray Observatory (SWGO). Currently under development, it will be the first instrument of its kind in the southern hemisphere, and like HAWC, it will use water Cherenkov detectors for ground-level particle detection. One of Huentemeyers most important missions is advocating for the updated instrumentation and expanded capacity at higher altitudes that is essential to probe some of the most extreme environments in the known universe while seeking further discoveries.

Among the top three cited authors at Michigan Tech, Huentemeyer participated in a paper on multimessenger observations of a binary neutron star merger that has been cited more than 3,200 times.

Grasping concepts that seem impossible to understand requires both curiosity and persistence, Huentemeyer said. Spoiler alert: Theres a scene in Oppenheimer thats reminiscent of how she met the challenge.

In the movie, they show how quantum mechanics was a new thing that had just come out of Europe. There were skeptics everywhere. Oppenheimer came back from his time in Europe to teach quantum mechanics at Caltech in 1946. The first day theres one student in class. Hes all excited that this one student shows up. And then, as it is in movies, they cut to scenes where more and more students show up each time. That reminded me of me as a student, she said. I couldnt understand it. It was so contrary to anything I had learned previously about physics. Everything was deterministic. Not saying quantum mechanics is not at all deterministic, but it has a probabilistic aspect to it.

The annual Michigan Tech Research Award sets a high bar for outstanding achievement in sustained research or a single noteworthy breakthrough. Nominations open each spring. The winner receives a plaque and $2,500 cash award.

The more unknowns she discovered, the more certain Huentemeyer became regarding a career path. I really wanted to dig deeper and do particle physics, she said. There were semesters during my undergrad when I was very close to quitting, because it was rough. But I stuck with it.

Her graduate and postdoctoral research took her to places where pioneers like Oppenheimer also worked and studied, including Los Alamos National Laboratory, which was covertly erected in 1943 for development and testing of the worlds first atom bomb, known as The Gadget. Projects she was involved in include the Milagro Observatory collaboration in New Mexico; the High Resolution Flys Eye (HiRes) Experiment in Utah; Fluorescence in Air From Showers (FLASH) Experiment at the national particle accelerator laboratory located at Stanford Linear Accelerator Center (SLAC); and the Omni-Purpose Apparatus at LEP (OPAL) Experiment at CERN in Geneva, Switzerland.

"Maybe solid-state physics would have been more lucrative and provided a clearer path to a career outside academia, Huentemeyer said. But I ended up just doing what I wanted to do, which was particle physics and experimental fundamental research.

Huentemeyers students have also become important members of the research community. The postdoctoral researchers and doctoral students she has mentored have taken positions at top-ranked institutions, including NASAs Marshall and Goddard space flight centers, Los Alamos National Laboratory and the Tsung-Dao Lee Institute at Shanghai Jiao Tong University. Kelci Mohrman, who received a U.S. Department of Energy Award among other honors during her time as an undergraduate student at Tech, went on to pursue a graduate degree at Notre Dame, winning the 2023 Department of Physics and Astronomy Research and Dissertation Award.

In her own words, the 2023 Research Award Winner reflects on her research, teaching and service and how her career trajectory led her to Michigan Tech.

Q: Say youre in a caf or some other place where people strike up conversations. How do you describe your work?

PH: Its not easy to explain, but let me try. First, Im a physicist. Then if you were to ask me what I do as a physicist, I may say Im an astrophysicist and then people get somewhat nervous (laughs). But what I often notice is people tend to think of astrophysicists as maybe more theoretical people who develop models, and cosmologists and Im not. Im clearly, squarely an experimentalist. I would also tell them that my background is in particle physics. I got my Ph.D. at the University of Hamburg working with a CERN experiment in Switzerland. I moved as a postdoc into a subset of astrophysics called astroparticle physics. I focus on particle acceleration in space. If I had to sum it up in a sentence, I would say that I do experimental fundamental research to learn more about the nature and transport of matter and energy in the universe.

Q: Why does your research matter?PH: CERN is where the World Wide Web was born. Its not like the scientists coming there from all parts of the world said, Oh, lets invent the World Wide Web. It was that people needed to communicate across the globe and there was one person who had this idea about having all these servers and pretending they are somewhere else and they talk to each other. He developed the HTTP (hypertext transfer) protocol in order to accomplish that: the basis of the World Wide Web. Before, there was the internet as we know it developed by DARPA (Defense Advanced Research Projects Agency). But the innovation became more used by physicists and scientists across the globe, and then by everyone else. Physics research thrives when we talk to one another. Thats how we come up with new ideas. Theres no way to accomplish our goals without communication. Thats how that happened. So they didnt set out to do something that ultimately changed how we all interact. It was a byproduct.

Similarly, we might wonder whether Otto Hahn, when he was doing experiments in his basement in Berlin with Meitner and others, was thinking about building a nuclear power plant. Maybe they were. But I bet what they really wanted to understand was what the force is that keeps the nucleus together. Their focus was really understanding. The path to understanding is the path to discovery.

Semiconductors are another example leading to applications that some people might find very useful and others find annoying (laughs and points to her laptop and smartphone).

Q: Tell us more about the international observatories youre involved in founding and maintaining. Why are HAWC and SWGO so important?

PH: Gamma and cosmic rays are everywhere in the universe and we can eventually measure them here on Earth after they interact with its atmosphere, which causes extensive air showers of secondary particles. To increase instrument sensitivity, we want to measure air showers at high altitudes, before too many of the secondary particles are absorbed. The collected particles from cascades are detected in faint flashes of light in water tanks. Catching more of these particles means we have more and better information. Once weve collected data from the showers, what were really interested in is the energy of the original particles and the direction of the particles they give us information about extreme energy processes in space.

Q: Why did you come to Michigan Tech?

PH: When this position came up it was shared with different collaborations, including the Milagro, which I was involved in while at Los Alamos. Tech had not been on my radar but I thought it was interesting and looked like a good fit. I knew that professors Brian Fick and David Nitz were in the physics department they are two of the pioneers in the field of experimental particle astrophysics. There are papers from the 1990s where both of their names are on them along with Jim Cronin, whos a Nobel Prize winner. We also have Bob Nemiroff, one of the founders of APOD (NASAs Astronomy Picture of the Day).

Everyone seemed extremely nice and welcoming. I knew there were people I could talk to about my research and they would have good insights. I remember flying in. It was November. It wasnt great weather, but I could imagine what it would look like in the summer and fall, with all those trees, and I was like Wow, this is beautiful.

Q: What have you learned from your students? Whats your favorite aspect of teaching?

PH: Teaching helps me to become more precise in what Im saying. If youre using all these technical terms you havent introduced, students are just looking at you like, What are you talking about? Or if you use terms they may know from another context, but that have a very specific meaning in physics.

For me, the rewarding part is when I get feedback from students directly. I really, really like advising students, undergrad as well as graduate, on their research topics. Its also great when you can tell a colleague about a student whos really good and they are like, Oh, I need a postdoc.

Q: Whats next in your research?

PH: I need to go get a lot of money (laughs). Theres a lot of work ahead for our collaboration to secure funding for SWGO, which will be sited in South America between 10 and 30 degrees south at an altitude of 4.4 kilometers or higher. The collaboration hasnt yet decided on an exact location. Besides potential sites, there are several other ongoing research and development tasks that go into establishing the observatory. We have 14 countries from five continents who are working on this project, which will be larger than HAWC, with better sensitivity.

I also have an interest in making astroparticle physics and what we are doing with HAWC and SWGO more known to astronomers. Astronomers think on different scales, like the James Webb telescope, way more expensive but way out there, detecting light which we do, too, but we are detecting the most energetic form of light. I understand why its not often on their radar. We have detected between 200 to 300 sources of gamma rays. And they have billions of stars to work with. On the other hand, we are testing a phase space that they are not. I hope more astronomers will pay attention to that. Its always a concerted effort. Its not an isolated scientist sitting in a lab and doing things. We all need to build bigger and more sensitive instruments.

My field can contribute to understanding things we dont quite have a handle on yet. Dark matter, for example. The more sensitive our instruments become at HAWC or SWGO, for instance, we can look for these signatures that would be a sign of dark matter in space. We know its there. We just dont know what it is.

Q: On a lighter note, besides movies, what else do you like to do in your free time?PH: I like to hike, but havent had much chance lately. I bought a new ebike recently and enjoy cycling to work. I also enjoy winter camping with friends at least once a year.

Michigan Technological University is a public research university founded in 1885 in Houghton, Michigan, and is home to more than 7,000 students from 55 countries around the world. Consistently ranked among the best universities in the country for return on investment, Michigans flagship technological university offers more than 120 undergraduate and graduate degree programs in science and technology, engineering, computing, forestry, business and economics, health professions, humanities, mathematics, social sciences, and the arts. The rural campus is situated just miles from Lake Superior in Michigan's Upper Peninsula, offering year-round opportunities for outdoor adventure.

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