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Bitcoin Trading Is Booming in Uncertain Russia, With 350% Spike in New Users on Paxful | Exchanges – Bitcoin News

Bitcoin trading is growing in Russia. Thats despite attempts by the government to make it difficult for investors to do so.

For years, Russian lawmakers have blown hot and cold over cryptocurrency regulation, creating an atmosphere that has often left the entire digital asset industry in the country on tenterhooks.

According to Paxful, Russian users joining the peer-to-peer bitcoin (BTC) exchange have increased by 350% over the last 12 months. New registrations have swelled to record highs month-on-month since the new coronavirus outbreak in March.

The exchange said it is now seeing an average monthly trading volume of $4 million in the Eastern European country, compared to other P2P platforms.

For payment, Russians prefer to use gift cards, online wallets, bank transfers, and credit or debit cards, it stated in a statement shared with news.Bitcoin.com. Anton Kozlov, Paxfuls Manager for the Russian market, said:

Crisis aside, Russia has always had a monolithic banking system that is dominated by a few players, and the sentiment we get is that Russians are increasingly looking to find alternative ways to grow their earnings and participate in the financial market. Bitcoin within the P2P context allows them much more freedom to do so and our data is proving it.

A new law passed on July 22 prohibits the use of bitcoin to pay for goods and services, but grants legal recognition to cryptocurrencies. Such clarity may help drive further growth of the Russian digital asset market.

Russia is reportedly the largest P2P bitcoin trading market in Europe, but a lot of the trading takes place on Localbitcoins, with a volume of about $32 million changing hands this month, according to data from Useful Tulips.

For the same period, the research firm puts Paxfuls BTC trading volume in Russia at just $405,000 a figure that contradicts the one issued by the exchange itself as cited elsewhere in this report.

Paxful said earlier this July that its bitcoin trading volumes climbed 35% to $1.1 billion during the first six months of 2020 compared to $817 million a year ago.

The growing U.S. exchange revealed that more than $182 million worth of BTC, on average, was traded on the platform every month between January and June this year. Nigeria, U.S., Ghana, India, and Kenya led the growth, with emerging markets rising fastest.

To date, Paxful has accumulated 4.5 million users and reached a total of $4.6 billion trading volume for BTC since it started operations in 2015.

What do you think about Russias growing bitcoin trading activity? Let us know in the comments section below.

Image Credits: Shutterstock, Pixabay, Wiki Commons

Disclaimer: This article is for informational purposes only. It is not a direct offer or solicitation of an offer to buy or sell, or a recommendation or endorsement of any products, services, or companies. Bitcoin.com does not provide investment, tax, legal, or accounting advice. Neither the company nor the author is responsible, directly or indirectly, for any damage or loss caused or alleged to be caused by or in connection with the use of or reliance on any content, goods or services mentioned in this article.

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17-year-old accused of masterminding Twitter bitcoin scam – CNBC

A 17-year-old in Tampa, Florida, is accused of taking over the Twitter accounts of Elon Musk, Bill Gates, Barack Obama and numerous other celebrities to scam people into sending the teen bitcoin.

The teen, whose name and photo CNBC is not publishing because the teen is a minor, was arrested and charged, the office of Hillsborough County State Attorney Andrew Warrenannounced on Friday.

Warren's office described the teen as the "mastermind" behind the attack.

"These crimes were perpetrated using the names of famous people and celebrities, but they're not the primary victims here," Warren said in a statement. "This 'Bit-Con' was designed to steal money from regular Americans from all over the country, including here in Florida. This massive fraud was orchestrated right here in our backyard, and we will not stand for that."

Warren's office has filed 30 felony charges against the 17-year-old. The charges include organized fraud, communications fraud, fraudulent use of personal information and access of computer or electronic device without authority.

Two adults were also charged, the Department of Justice said Friday.

Mason Sheppard, aka "Chaewon," 19, of Bognor Regis, in the United Kingdom, was charged in a criminal complaint in the Northern District of California with conspiracy to commit wire fraud, conspiracy to commit money laundering, and the intentional access of a protected computer.

Nima Fazeli, aka "Rolex," 22, of Orlando, Florida, was charged in a criminal complaint in the Northern District of California with aiding and abetting the intentional access of a protected computer.

The teen's scam reaped more than $100,000 worth of bitcoin on July 15, according to Warren's office.

Twitter provided its most recent update into the attack on Thursday evening.

"The social engineering that occurred on July 15, 2020, targeted a small number of employees through a phone spear phishing attack,"Twitter said in a blog post. "A successful attack required the attackers to obtain access to both our internal network as well as specific employee credentials that granted them access to our internal support tools. Not all of the employees that were initially targeted had permissions to use account management tools, but the attackers used their credentials to access our internal systems and gain information about our processes."

Twitter acknowledged the charges and arrest on Friday.

"We appreciate the swift actions of law enforcement in this investigation and will continue to cooperate as the case progresses," Twitter said in a tweet. "For our part, we are focused on being transparent and providing updates regularly."

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Bitcoin Scaling Tech Could Have Saved Companies and Users $500M in Fees: Report – CoinDesk – CoinDesk

A new study from Bitcoin startup Veriphi finds companies and users sending bitcoin transactions could have saved more than half a billion dollars in fees if all companies, including wallets and exchanges, had used the most up-to-date technology.

Each bitcoin transaction has an optional fee tacked on. Users have the ability to choose the amount of this fee. If the Bitcoin blockchain is particularly busy, seeing too many transactions at once, a higher fee will ensure a transaction gets picked up by miners and goes through faster.

Bitcoin fees cost an average of about $3 per transaction, according to Bitcoin statistic site bitinfocharts. Fees rise with demand. There have been times in Bitcoins history, particularly in 2017, when fees exploded due to increasing demand. Bitcoin has limited space for transactions, so users had to pay higher fees if they wanted their transaction to go through faster.

These fees are a pain, so bitcoin developers have spent a lot of energy on carving out more Bitcoin block space to make room for new users and their transactions while keeping within the actual block-size constraint of 1 MB.

Transaction batching and SegWit

Veriphis report concludes companies could have saved 21,131.97 BTC in fees (worth $195 million) if all transactions from January 2012 to June 2020 had used a technique called transaction batching.

Transaction batching is a way of sending multiple transactions at once in order to cut down on paying for each individual transaction. This option is more likely to be used by companies, like exchanges Coinbase and Kraken, which send several transactions at once, rather than singular users.

Plus, users could have saved 36,685.72 BTC in fees (worth $339 million) if SegWit had been used on all transactions from August 2017 to June 2020. That adds up to a total of 57,817.69 BTC, worth more than $534 million at the time the report was released.

SegWit, officially added to Bitcoin in 2017, is a technology that allows for more space for transactions per block.

Even though SegWit was activated nearly three years ago, each individual wallet and bitcoin service needs to individually add support for these types of transactions. In some cases, individual users still need to opt in to using SegWit-enabled addresses for their transactions.

As can be expected, wallets and other bitcoin services have so far adopted SegWit at their own pace. Adding a new way to send transactions isnt a trivial task and requires engineering bandwidth; as such, some companies have not prioritized making the necessary infrastructure changes to their platforms.

If average fees grow higher than users would like, however, users who want to save on fees may jump from these slow-to-act platforms over to a bitcoin wallet or exchange thats adopted SegWit.

Bitcoin fees and the next bull run

That said, Gustavo J. Flores, Veriphi head of product and research argued that both SegWit and transaction batching have been around for years. And users of these wallets and services could have saved a lot of money if these technologies had been used for that entire time.

I saw the news a couple of months ago of Coinbase integrating transaction batching into their system and I thought how late that was, given that batching has been around since 2011 or 2012. We were wondering, how big was the impact of all these companies and users that hadnt adopted batching and Segwit? And it turned out to be a pretty substantial number: half a billion dollars, Flores told CoinDesk.

Now that bitcoins price has jumped to more than $11,000, perhaps signalling the start of the next bull run, its time to consider a scenario where fees might be on the rise again.

In the report, Veriphi encourages any person or entity responsible for sending many transactions to think about best practices for saving money on fees.

The savings potential presented is significant and those conducting large amounts of transactions should seriously consider employing these tools in order to remain competitive and save money.

The leader in blockchain news, CoinDesk is a media outlet that strives for the highest journalistic standards and abides by a strict set of editorial policies. CoinDesk is an independent operating subsidiary of Digital Currency Group, which invests in cryptocurrencies and blockchain startups.

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Government-Owned Swiss Bank Launching Crypto Trading and Custody Services | News – Bitcoin News

Basler Kantonalbank (BKB), Switzerlands eighth-largest bank, is getting into crypto through its subsidiary, Bank Cler. Owned by the Swiss Canton of Basel-City, BKB has total assets of approximately $49 billion.

Local Swiss government-owned commercial bank BKB will be offering cryptocurrency services through Bank Cler, the bank told Citywire Switzerland Monday. Founded in 1899, Basler Kantonalbank, also called Basel Cantonal Bank, offers retail, corporate and private banking services. It has total assets of approximately $49 billion.

Bank Cler said that its crypto push is in response to demand among its younger clientele, who wish to invest in crypto assets. Bank Clers spokesperson, Natalie Waltmann, told the news outlet:

We will launch an offering for the trading and custody of digital assets next year.

The bank has hired Alain Kunz to lead its digital asset business. His Linkedin page shows that he is the CEO of fintech company Polarlab and founder of Tokensuisse.

S&P Global Ratings gave BKB a stable outlook in December last year, which reflected on the banks owner and grantor, the Swiss Canton of Basel-City. We expect BKB to remain the eighth-largest bank in Switzerland, with total assets of CHF45 billion [$49 billion] as of June 30, 2019 consolidating its subsidiary Bank Cler, which had total assets of CHF18 billion at the same date, S&P Globals analysts wrote.

BKB and Bank Cler hold separate banking licenses in Switzerland. Waltmann further told the news outlet that BKB is also interested in cryptocurrencies. Other banks in Switzerland that have announced their cryptocurrency services include Seba, which launched a range of crypto services in November last year, Sygnum, Julius Baer, and Falcon. Maerki Baumann announced in June the launch of its trading and custody services, supporting bitcoin, bitcoin cash, ether, litecoin, and XRP initially.

What do you think about Bank Cler launching crypto services? Let us know in the comments section below.

Image Credits: Shutterstock, Pixabay, Wiki Commons

Disclaimer: This article is for informational purposes only. It is not a direct offer or solicitation of an offer to buy or sell, or a recommendation or endorsement of any products, services, or companies. Bitcoin.com does not provide investment, tax, legal, or accounting advice. Neither the company nor the author is responsible, directly or indirectly, for any damage or loss caused or alleged to be caused by or in connection with the use of or reliance on any content, goods or services mentioned in this article.

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Bitcoin and Biotech on My Mind as Defiant Bears Get Crushed – RealMoney

Strong momentum in big-cap technology stocks continues Monday morning as Apple (AAPL) continues to fly higher and the Nasdaq 100 (QQQ) hits a a new all-time high.

Breadth is running about four gainers for every three sellers so it is still a narrow market but the strength in the FATMAAN stocks (Facebook (FB) , Apple, Tesla (TSLA) , Microsoft (MSFT) Amazon (AMZN) , Alphabet (GOOGL) , Netflix (NFLX) ) is keeping sentiment very positive and crushing the bears that are fighting it.

Once again there is no real fundamental reason for the strength. It is a combination of liquidity, fear of missing out, and a short squeeze that is driving the action. The same bearish arguments that have been out there for many weeks still apply and are still being ignored.

Small-caps are lagging again but are still in positive territory. My list of 10% movers remains relatively short and there is an odd mix of action with no real dominant theme.

Biotechnology is bouncing back after some recent rough action and precious metals are pulling back due to strength in the dollar.

One new buy I added Monday morning is Xeris Pharmaceuticals (XERS) , which Dan Rosenblum of Shark Biotechnology points out has seen two weeks of good prescription data. The stock has been trading in a tight range after doing a secondary offering and has a good foundation for upside once the story is more widely understood.

I've also added a little Grayscale Bitcoin Trust (GBTC) , which continues to see good technical development. Over the weekend, bitcoin suffered a 10% "flash crash" but that was largely recouped and is not reflected in GBTC, which only trades during regular market hours.

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Bitcoin will drop to $10K before rally resumes – Asia Times

Despite being extremely volatile when compared to traditional asset classes, bitcoin (BTC) maintains a market equilibrium nature for the majority of the time, according to arecent report by cryptocurrency research firm Zubr.

The report emerged just a few days after bitcoin rallied beyond the $12,000 mark and its volatility finallyrecovered from a multi-year low, Cointelegraph reports.

Using data from CoinAPI, a cryptocurrency market data provider, Zubr found that bitcoin price swings are typically accompanied by nearly symmetrical movements on the opposite side, creating opportunities both on the positive and negative side.

According to Zubr: The majority of the time, Bitcoin will almost mimic the exact percentage increase with a percentage decrease on the very same day.

Typically, this mirror effect takes place within the same trading day, but Zubr also found that it can also occur over the course of longer time periods.

This means that over the short term, bitcoins recent rally to $12,000 could see a similar return to the $10,000 levels and a number of otherfactors point to the possibility of this pullback.

Developing a better awareness of market equilibrium and its relation to bitcoins price can be extremely insightful when incorporated into a day-trading strategy, especially considering that the volatility phenomenon discussed earlier has been constant since 2017.

Traders can ride the volatility and gain from both shorting and longing bitcoin on a daily basis. However, this is only one of the many things traders should have in mind.

According to Zubr: What the data is effectively indicating is lower risk opportunities are possible if one is to trust the historical events and deem such a swing intrinsic to bitcoins trading character. For example, should bitcoin increase by 10% and retreat back to its opening price, history indicates that there is an overwhelming chance (over 50%) that the price drops between 9-12% within the same day or following day.

While inconclusive on its own, this data point can be used when composing a strategy for intraday and momentum trading styles.

In the meantime, only time will tell if Bitcoin will maintain its current market equilibrium or continue higher above the $12K mark.

Asia Times Financialis now live. Linking accurate news, insightful analysis and local knowledge with the ATF China Bond 50 Index, the world'sfirst benchmark cross sector Chinese Bond Indices.Read ATFnow.

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Quantum leap? US plans for unhackable internet may not fructify within a decade, but India is far behind – The Financial Express

Last week, the US department ofenergy released a blueprint for a nationalquantum internet. The project if successful, the government claimed, willensure a safer and nearly unhackableinternet within the next decade. Earlierthis year, the University of Chicago, oneof the participants in DoEs project, hadcreated a 52-mile quantum loop totransfer subatomic particles.

The US, however, is not the only country to be working on quantum internet.

Dutch researchers are expected to es tablish a link between Delft and the Hague later this year. In February, Chineseresearchers, in a paper published in Nature had claimed to have successfully demonstrated some success in thisregard over a 50 km range.

Last year, when Google announcedthat its quantum computer had inchedcloser towards quantum supremacy when a computer can perform tasks that are out of reach for even the mostadvanced supercomputer blockchainexperts had expressed concerns aboutthe technology as it would make it easyto break encryption. Recently, currencyexchange and payments platform, Ripples CTO said that quantum computers could pose a threat to blockchain technology and bitcoin. Given that development of quantum computers is happening at an accelerated pace, there is also aneed for a quantum internet to transferinformation without danger of hacking.

While the US experiments are laudable, all eyes will now be on the Dutchresearchers as they would also demonstrate a quantum repeater, which willhelp transport a single photon over long distances. The problem, till now, in establishing such a network has been transferring a photon. A repeater, if successful,can make this a reality.

The success, in this case, is dependenton a property of quantum particles called entanglement.

Entanglementallows two photons, when observed, at aconsiderable distance to take opposite values from each other. Albert Einsteinin a 1935 EPR paper had discussed entanglement buttermedit as a spookyphenomenon as it defied his laws on relativity. Bell later confirmed Einsteinsobservation. But using photons has beenimpossible largely because a photon cannot be cloned. Any interference destroysthe information. And, this property iswhat makes them safe as well.

But developing a point-to-point connection is quite different from creatinga network. Dr Apoorva D Patel, one ofIndias leading quantum researchers anda professor at Centre for High EnergyPhysics, Indian Institute of Science, Bengaluru says that we are still a long wayfrom establishing a network. We wouldneed hubs, relays, standard storage anderror correction, and all this is still yearsaway. He also debunks the claims of aquantum internet within a decade. The10-year timeline is the governmentshypothesis, not the scientists hypothesis Even if it is developed, the speeds DrPatel says will be much slower, probablyby a factor of thousand, than the regular internet. And this will not improve. So, itwill have only limited application.

Besides, the system is not entirelyunhackable.The quantum transmission is unhackable, but end-points are still hackable. The sending and receiver stations are vulnerable, as at those points you are trying to convert the classical signal into the quantum signal or vice versa, Dr Patel says.

Even worse, India may only be a spectator in this quantum race. We are farbehind in terms of the quantum internet, and much more behind when itcomes to quantum computers. We arestarting from scratch, and the government will need to do more, Dr Patelhighlights.

While the government announced aplan to invest Rs 8,000 crore over the nextfive years in the National Mission onquantum technology in the Budget, nodisbursement has been made till now.

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Google distinguished scientist Hartmut Neven is one of Fast Company’s – Fast Company

A pioneer in AI-powered computer vision, whose research helps power Google Maps, YouTube, and more, Hartmut Neven now leads Googles efforts in quantum computingthe still-emerging science that aims to transform fields as diverse as pharmaceutical discovery and financial services by manipulating subatomic particles. In October 2019, his team published a paper stating that its processor, Sycamore, had achieved quantum supremacy by performing calculations in 200 seconds that would take 10,000 years with a conventional computer. The feat wasnt without controversyquantum rival IBM contended that its fastest supercomputer would take only two and a half days to do the same, downgrading the magnitude of Googles claimbut it was still widely hailed as a landmark.

The quantum project has posed new challenges, such as how to cool a processor to near absolute-zero temperatures using liquid helium. But Neven has always thrived on the edge. He was among the first to connect the AI revolution currently in full swing and quantum advances yet to come. Im guilty of having popularized the terms quantum machine learning and quantum AI, he says. Now there are whole sections of departments at universities that do quantum machine learning.

When people ask Neven how soon quantum computers will be ready for commercial deployment in areas where their speed might be transformative, his standard estimate is 10 years. He appreciates Google giving him the runway. Theres this nerdy pleasure of pushing into disciplines that are intrinsically fascinating, he says. Not, When can we see a return on our investment? But, Hey, this sounds interesting. Sooner or later, this technology will play an important role. Why dont you explore it?'

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Giant atoms enable quantum processing and communication in one – MIT News

MIT researchers have introduced a quantum computing architecture thatcan perform low-error quantum computations while also rapidly sharing quantum information between processors. The work represents a key advance toward a complete quantum computing platform.

Previous to this discovery, small-scale quantum processors have successfully performed tasks at a rate exponentially faster than that of classical computers. However, it has been difficult to controllably communicate quantum information between distant parts of a processor. In classical computers, wired interconnects are used to route information back and forth throughout a processor during the course of a computation. In a quantum computer, however, the information itself is quantum mechanical and fragile, requiring fundamentally new strategies to simultaneously process and communicate quantum information on a chip.

One of the main challenges in scaling quantum computers is to enable quantum bits to interact with each other when they are not co-located, says William Oliver, an associate professor of electrical engineering and computer science, MIT Lincoln Laboratory fellow, and associate director of the Research Laboratory for Electronics. For example, nearest-neighbor qubits can easily interact, but how do I make quantum interconnects that connect qubits at distant locations?

The answer lies in going beyond conventional light-matter interactions.

While natural atoms are small and point-like with respect to the wavelength of light they interact with, in a paper published today in the journal Nature, the researchers show that this need not be the case for superconducting artificial atoms. Instead, they have constructed giant atoms from superconducting quantum bits, or qubits, connected in a tunable configuration to a microwave transmission line, or waveguide.

This allows the researchers to adjust the strength of the qubit-waveguide interactions so the fragile qubits can be protected from decoherence, or a kind of natural decay that would otherwise be hastened by the waveguide, while they perform high-fidelity operations. Once those computations are carried out, the strength of the qubit-waveguide couplings is readjusted, and the qubits are able to release quantum data into the waveguide in the form of photons, or light particles.

Coupling a qubit to a waveguide is usually quite bad for qubit operations, since doing so can significantly reduce the lifetime of the qubit, says Bharath Kannan, MIT graduate fellow and first author of the paper. However, the waveguide is necessary in order to release and route quantum information throughout the processor. Here, weve shown that its possible to preserve the coherence of the qubit even though its strongly coupled to a waveguide. We then have the ability to determine when we want to release the information stored in the qubit. We have shown how giant atoms can be used to turn the interaction with the waveguide on and off.

The system realized by the researchers represents a new regime of light-matter interactions, the researchers say. Unlike models that treat atoms as point-like objects smaller than the wavelength of the light they interact with, the superconducting qubits, or artificial atoms, are essentially large electrical circuits. When coupled with the waveguide, they create a structure as large as the wavelength of the microwave light with which they interact.

The giant atom emits its information as microwave photons at multiple locations along the waveguide, such that the photons interfere with each other. This process can be tuned to complete destructive interference, meaning the information in the qubit is protected. Furthermore, even when no photons are actually released from the giant atom, multiple qubits along the waveguide are still able to interact with each other to perform operations. Throughout, the qubits remain strongly coupled to the waveguide, but because of this type of quantum interference, they can remain unaffected by it and be protected from decoherence, while single- and two-qubit operations are performed with high fidelity.

We use the quantum interference effects enabled by the giant atoms to prevent the qubits from emitting their quantum information to the waveguide until we need it. says Oliver.

This allows us to experimentally probe a novel regime of physics that is difficult to access with natural atoms, says Kannan. The effects of the giant atom are extremely clean and easy to observe and understand.

The work appears to have much potential for further research, Kannan adds.

I think one of the surprises is actually the relative ease by which superconducting qubits are able to enter this giant atom regime. he says. The tricks we employed are relatively simple and, as such, one can imagine using this for further applications without a great deal of additional overhead.

Andreas Wallraff, professor of solid-state physics at ETH Zurich, says the research "investigates a piece of quantum physics that is hard or even impossible to fathom for microscopic objects such as electrons or atoms, but that can be studied with macroscopic engineered superconducting quantum circuits. With these circuits, using a clever trick, they are able both to protect their giant atom from decay and simultaneously to allow for coupling two of them coherently. This is very nice work exploring waveguide quantum electrodynamics."

The coherence time of the qubits incorporated into the giant atoms, meaning the time they remained in a quantum state, was approximately 30 microseconds, nearly the same for qubits not coupled to a waveguide, which have a range of between 10 and 100 microseconds, according to the researchers.

Additionally, the research demonstrates two-qubit entangling operations with 94 percent fidelity. This represents the first time researchers have quoted a two-qubit fidelity for qubits that were strongly coupled to a waveguide, because the fidelity of such operations using conventional small atoms is often low in such an architecture. With more calibration, operation tune-up procedures and optimized hardware design, Kannan says, the fidelity can be further improved.

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Computer Scientist Don Towsley Named to Team Developing the Quantum Internet – UMass News and Media Relations

The National Science Foundation this week announced a five-year, $26 million initial grant to a consortium led by the University of Arizona to form a new Engineering Research Center, the Center for Quantum Networks (CQN), with partners at Harvard, Yale and MIT, among others, and including quantum networking researcher Don Towsley of the College of Information and Computer Sciences.

One of the centers goals is to develop quantum communications and the quantum internet, where bits of information are encoded in photons of infrared light, for example, instead of radio waves when beaming from a satellite. Once developed fully, quantum communication is expected to be more secure than existing systems.

Towsley says his role in the multi-institution team will be to co-lead one of three research thrusts focused on quantum network architecture. In addition to leadership responsibilities, Towsley will perform research on fundamental performance limits of quantum networks and on the right protocols to achieve these limits.

The University of Arizona leadership team says they hope the new CQN will lay the foundations for a quantum internetby transforming computing, communication and sensing on a new platform. It will connect quantum computers, data centers and gadgets using information states of quantum bits known asqubits. These will someday offer increased processing capacity over the classical data system. It now relies on data storage and processing in the 0 or 1 bit state, but qubits will allow superposition of both states at the same time.

The CQN also is charged with investigating the effects of a future quantum internet on education, workforce development, innovation and society. Organizers also say CQN has a mandate to develop not only the technology, but to address concurrent topics science, law, policy and society as they emerge, within a strong culture of inclusion. It will also emphasize engineering workforce development and include raising student awareness with curriculum and projects involving policy, law and society.

The new CQN will also create Master of Science programs in quantum information science and engineering, believed to be the first of its kind. Another major focus of the CQN team will be research to advance key underlying technologies, including fundamental quantum materials and devices, the quantum and classical processing required at a network node, and quantum network protocols and architectures.

Other universities involved are Brigham Young University, Howard University, Northern Arizona University and the universities of Chicago and Oregon.

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