Tag: quantum computing

  • A wave of retractions is shaking physics

    A wave of retractions is shaking physics

    [ad_1]

    Ziemelis also emphasized that “retractions are not always bad.” While some retractions occur because of research misconduct, “some retractions are of a much more innocent variety—the authors having made or being informed of an honest mistake, and upon reflection, feel they can no longer stand behind the claims of the paper,” he said while speaking on a panel. Indeed, physicist James Hamlin of the University of Florida, one of the presenters and an independent reviewer of Dias’s work, discussed how he had willingly retracted a 2009 experiment published in Physical Review Letters in 2021 after another researcher’s skepticism prompted him to reanalyze the data. 

    What’s new is that “the ease of sharing data has enabled scrutiny to a larger extent than existed before,” says Jelena Stajic, an editor at Science. Journals and researchers need a “more standardized approach to how papers should be written and what needs to be shared in peer review and publication,” she says.

    Focusing on the scandals “can be distracting” from systemic problems in reproducibility, says attendee Frank Marsiglio, a physicist at the University of Alberta in Canada. Researchers aren’t required to make unprocessed data readily available for outside scrutiny. When Marsiglio has revisited his own published work from a few years ago, sometimes he’s had trouble recalling how his former self drew those conclusions because he didn’t leave enough documentation. “How is somebody who didn’t write the paper going to be able to understand it?” he says.

    Problems can arise when researchers get too excited about their own ideas. “What gets the most attention are cases of fraud or data manipulation, like someone copying and pasting data or editing it by hand,” says conference organizer Brian Skinner, a physicist at Ohio State University. “But I think the much more subtle issue is there are cool ideas that the community wants to confirm, and then we find ways to confirm those things.”

    But some researchers may publish bad data for a more straightforward reason. The academic culture, popularly described as “publish or perish,” creates an intense pressure on researchers to deliver results. “It’s not a mystery or pathology why somebody who’s under pressure in their work might misstate things to their supervisor,” said Eugenie Reich, a lawyer who represents scientific whistleblowers, during her talk.

    Notably, the conference lacked perspectives from researchers based outside the US, Canada, and Europe, and from researchers at companies. In recent years, academics have flocked to companies such as Google, Microsoft, and smaller startups to do quantum computing research, and they have published their work in Nature, Science, and the Physical Review journals. Frolov says he reached out to researchers from a couple of companies, but “that didn’t work out just because of timing,” he says. He aims to include researchers from that arena in future conversations.

    After discussing the problems in the field, conference participants proposed feasible solutions for sharing data to improve reproducibility. They discussed how to persuade the community to view data sharing positively, rather than seeing the demand for it as a sign of distrust. They also brought up the practical challenges of asking graduate students to do even more work by preparing their data for outside scrutiny when it may already take them over five years to complete their degree. Meeting participants aim to publicly release a paper with their suggestions. “I think trust in science will ultimately go up if we establish a robust culture of shareable, reproducible, replicable results,” says Frolov. 

    Sophia Chen is a science writer based in Columbus, Ohio. She has written for the society that publishes the Physical Review journals, and for the news section of Nature

    [ad_2]

    Source link

  • Quantum repeater: Quantum internet draws near thanks to entangled memory breakthroughs

    Quantum repeater: Quantum internet draws near thanks to entangled memory breakthroughs

    [ad_1]

    Quantum networks could spread across a city

    Fit Ztudio/Shutterstock

    Efforts to build a global quantum internet have received a boost from two developments in quantum information storage that could one day make it possible to communicate securely across hundreds or thousands of kilometres.

    The internet as it exists today involves sending strings of digital bits, or 0s and 1s, in the form of electrical or optical signals, to transmit information. A quantum internet, which could be used to send unhackable communications or link up quantum computers, would use quantum bits  instead. These rely on a quantum property called entanglement, a phenomenon in which particles can be linked and measuring one particle instantly influences the state of another, no matter how far apart they are.

    Sending these entangled quantum bits, or qubits, over very long distances, requires a quantum repeater, a piece of hardware that can store the entangled state in memory and reproduce it to transmit it further down the line. These would have to be placed at various points on a long-distance network to ensure a signal gets from A to B without being degraded.

    Quantum repeaters don’t yet exist, but two groups of researchers have now demonstrated long-lasting entanglement memory in quantum networks over tens of kilometres, which are the key characteristics needed for such a device.

    Can Knaut at Harvard University and his colleagues set up a quantum network consisting of two nodes separated by a loop of optical fibre that spans 35 kilometres across the city of Boston. Each node contains both a communication qubit, used to transmit information, and a memory qubit, which can store the quantum state for up to a second. “Our experiment really put us in a position where we’re really close to working on a quantum repeater demonstration,” says Knaut.

    To set up the link, Knaut and his team entangled their first node, which contains a type of diamond with an atom-sized hole in it, with a photon that they sent to their second node, which contains a similar diamond. When the photon arrives at the second diamond, it becomes entangled with both nodes. The diamonds are able to store this state for a second. A fully functioning quantum repeater using similar technology could be demonstrated in the next couple of years, says Knaut, which would enable quantum networks connecting cities or countries.

    In separate work, Xiao-Hui Bao at the University of Science and Technology of China and his colleagues entangled three nodes together, each separated by around 10 kilometres in the city of Hefei. Bao and his team’s nodes use supercooled clouds of hundreds of millions of rubidium atoms to generate entangled photons, which they then sent across the three nodes. The central of the three nodes is able to coordinate these photons to link the atom clouds, which act as a form of memory.

    The key advance for Bao and his team’s network is to match the frequency of the photons meeting at the central node, which will be crucial for quantum repeaters connecting different nodes. While the storage time was less than Knaut’s team, at 100 microseconds, it is still long enough to perform useful operations on the transmitted information.

    These demonstrations of quantum entanglement memory are a big achievement compared with where quantum internet technologies were 10 years ago, says Mohsen Razavi at the University of Leeds, UK. However, a fully functional network with quantum repeaters will need higher entanglement generation rates, he says.

    “This does point towards a very scalable and large-user-number quantum network,” says Alex Clark at the University of Bristol, UK. “The current entanglement rates are very slow and limited by various efficiencies in the systems, so there is a lot of quantum and classical network engineering that’s going to have to go into reducing those losses and increasing those efficiencies.”

     

    Topics:

    [ad_2]

    Source link

  • UK joins European supercomputer scheme EuroHPC

    UK joins European supercomputer scheme EuroHPC

    [ad_1]

    With the UK’s membership in EuroHPC, British academics are poised to gain access to substantial future supercomputer research funding.

    Joining the European High Performance Computing Joint Undertaking (EuroHPC) will boost the UK’s world-leading supercomputing research community, which can power the discovery of new drugs and harness AI’s potential.

    The supercomputer scheme brings together supercomputing resources from across 35 countries, including Norway, Turkey, and all 27 EU Member States.

    Science, Innovation and Technology Secretary, Michelle Donelan said: “This deal will only strengthen the UK’s science and tech superpower credentials, by giving our scientists and businesses even greater access to a leading network of expertise and powerful computing systems from Finland to Portugal.”

    Benefits of joining EuroHPC

    The move will support UK scientists to make use of Europe’s supercomputing facilities.

    Their ability to solve problems with more speed than traditional computers makes these systems vital to the development of new discoveries that will benefit society.

    Joining EuroHPC will boost the UK’s leadership in supercomputing as members pool resources to develop scientific excellence.

    UK scientists will now have the opportunity to bid for research support, strengthening the UK’s computer capacity.

    The move builds on the government’s £1.5bn plan to deliver world-leading computer facilities for the nation’s businesses and researchers.

    This includes backing for the Isambard-AI supercomputer in Bristol and the Dawn supercomputer in Cambridge, both of which will come online this year.

    Access granted through EuroHPC

    UK researchers will have access to:

    • LUMI, a pre-exascale supercomputer located in Kajaani, Finland
    • Leonardo, a pre-exascale EuroHPC supercomputer in the Bologna Technopole, Italy
    • MareNostrum 5, a pre-exascale EuroHPC supercomputer located in Barcelona, Spain
    • MeluXina, a petascale supercomputer located in Bissen, Luxembourg
    • Karolina, a petascale supercomputer located in Ostrava, Czech Republic
    • Discoverer, a petascale supercomputer located in Sofia, Bulgaria
    • Vega, a petascale supercomputer located in Maribor, Slovenia
    • Deucalion, a petascale EuroHPC supercomputer located in Guimarães, Portugal

    Association with Horizon Europe

    In November 2023, the UK’s deal to associate with Horizon Europe secured access to future EuroHPC supercomputers.

    The Horizon Europe-funded part of the programme will be worth over £770m between 2021 and 2027.

    With match funding from the UK Government, researchers can bid confidently for further EuroHPC grants, ensuring access to cutting-edge facilities.

    EuroHPC grants require match-funding from the UK on a case-by-case basis. More information on how this will be made available will be provided soon.

    Researchers can apply for time on EuroHPC systems and for Horizon-funded research and innovation grants on the EuroHPC website.

    [ad_2]

    Source link

  • World’s purest silicon paves way towards scalable quantum computers

    World’s purest silicon paves way towards scalable quantum computers

    [ad_1]

    Scientists at the University of Manchester, in collaboration with the University of Melbourne, have produced an ultra-pure form of silicon that allows the construction of high-performance qubit devices for scalable quantum computers.

    High-performance qubit devices are a fundamental part of quantum computing, paving the way for their scale up.

    The findings, published in Communications Materials – Nature, could revolutionise the future of quantum computing.

    Biggest challenges in developing quantum computers

    One of the biggest challenges in the development of quantum computers is that qubits are highly sensitive, requiring a stable environment to maintain the information they hold.

    Even temperature fluctuations, which are tiny changes in their environment, can cause computer errors.

    Another issue is their scale in physical size and processing power.

    Ten qubits have the same power as 1,024 bits in a normal computer and can occupy a much smaller volume.

    A fully performing quantum computer needs around one million qubits, providing the capability unfeasible by any classical computer.

    Silicon’s role in computing

    Silicon is the underpinning material in classical computing due to its semiconductor properties.

    The team believes it could be the answer to scalable quantum computers. However, using silicon in quantum computers presents challenges.

    Natural silicon is made up of three atoms of different mass – silicon 28, 29 and 30. However, the Si-29, making up around 5% of silicon, triggers a ‘nuclear flip-flopping’ effect, causing the qubit to lose information.

    Now, scientists have developed a way to remove silicon 29 and 30 atoms, making it the perfect material to make quantum computers at scale and with high accuracy.

    The world’s purest silicon provides a pathway to the creation of one million qubits.

    Ravi Acharya, a PhD researcher who performed experimental work in the project, explained: “The great advantage of silicon quantum computing is that the same techniques that are used to manufacture the electronic chips — currently within an everyday computer that consist of billions of transistors — can be used to create qubits for silicon-based quantum devices.

    “The ability to create high quality silicon qubits has in part been limited to date by the purity of the silicon starting material used. The breakthrough purity we show here solves this problem.”

    A roadmap to scale up quantum devices

    The breakthrough offers a roadmap towards scalable quantum computers with unparalleled performance and capabilities.

    It holds the promise of transforming technologies in ways hard to imagine.

    Project co-supervisor, Professor David Jamieson, from the University of Melbourne, said: “Our technique opens the path to reliable quantum computers that promise step changes across society, including in artificial intelligence, secure data and communications, vaccine and drug design, and energy use, logistics and manufacturing.

    “Now that we can produce extremely pure silicon-28, our next step will be to demonstrate that we can sustain quantum coherence for many qubits simultaneously. A reliable quantum computer with just 30 qubits would exceed the power of today’s supercomputers for some applications.”

    [ad_2]

    Source link

  • How Schrödinger’s cat could make quantum computers work better

    How Schrödinger’s cat could make quantum computers work better

    [ad_1]

    Concept of quantum computer

    An artist’s concept of a quantum computer

    sakkmesterke / Alamy

    A quantum bit inspired by Schrödinger’s cat has managed to resist making errors for an unusually long time in a quantum computing experiment. This may make it a promising building block for more reliable quantum computers in the future.

    Researchers have long believed that quantum computers can solve problems that are impossible for conventional computers, but there have been very few demonstrations of such capability so far. This is because quantum computers tend to make errors as they compute, but building a quantum computer powerful enough to correct its own errors is technically difficult.

    Zaki Leghtas at the École Normale Supérieure in France and his colleagues, in collaboration with the quantum computing start-up Alice & Bob, have now created a quantum bit, or qubit, that avoids making a particularly common type of error for the unprecedentedly long time of 10 seconds.

    They made their qubit by trapping light in a small hole on a chip filled with tiny circuits made from perfectly conducting – or “superconducting” – wires. The light could oscillate back and forth in two different ways inside the hole. But instead of forcing it to oscillate one way only, the team made it do both – creating a quantum superposition similar to the one involving the cat in Erwin Schrödinger’s famous thought experiment. This type of qubit is, accordingly, called a “cat qubit”.

    Leghtas says that for more than 10 years, physicists have theorised that cat qubits should be particularly unlikely to make so-called bit-flip errors, which are equivalent to the digital 0s in a conventional computer spontaneously becoming 1s, or vice versa. But demonstrating that cat qubits in the lab are so resistant to bit-flips is not straightforward.

    For several years, he says he and his colleagues were detecting bit-flip errors in their cat qubit every few milliseconds. Recently, however, they realised that many of these errors were actually induced by the way they were measuring the cat qubit’s states. Redesigning that process led them to a major technical leap: their cat qubit can now function for 10 seconds without bit-flipping, which is 10,000 times longer than in any past experiment.

    The researchers have only built one cat qubit with this property so far, but building more of them could be a step towards reliably useful quantum computers. This is because a computer built with the cat qubits could devote more of them to computation, rather than reserving just a few for computation and using the others to correct bit-flip errors in the computational qubits. Leghtas says that using these cat qubits could cut the number of qubits needed for error-correction by about 10 times compared with other qubit designs involving superconducting circuits.

    Christian Andersen at the Delft University of Technology in the Netherlands says that while 10 seconds in between bit-flips is a very long time for a qubit, it is not the only qubit property that matters. There is a trade-off between making the cat qubit more resilient to bit-flip errors and having it inadvertently become more prone to other kinds of errors. Future studies will have to find the most practical way to deal with that, he says.

    “This is really cool, it’s nice progress, but there are also many challenges,” says Andersen.

    Topics:

    • quantum computing/
    • quantum physics

    [ad_2]

    Source link

  • EU and Japan advance partnership for digital transformation

    EU and Japan advance partnership for digital transformation

    [ad_1]

    The EU and Japan have held their second Digital Partnership Council in Brussels, promoting their vision for a digital transformation that respects fundamental rights.

    The Digital Partnership Council was co-chaired by Commissioner for the Internal Market, Thierry Breton, and by Japanese Minister for Digital Transformation, Taro Kono, the Minister of Internal Affairs and Communications, Takeaki Matsumoto, and the Parliamentary Vice-Minister of Economy, Trade and Industry, Taku Ishii.

    The EU and Japan welcomed the implementation of the Digital Partnership and reviewed the progress achieved since the first Digital Partnership Council in 2023.

    The partners agreed on a list of new deliverables to cooperate on important digital technologies, including artificial intelligence (AI), 5G, 6G, semiconductors, high-performance computing (HPC) and quantum technology, submarine cables, eID, and cybersecurity.

    Memorandum of Cooperation

    At the second Digital Partnership Council, the EU and Japan signed a Memorandum of Cooperation on digital identities and trust services.

    The Memorandum will facilitate data free flow with trust through cooperation and use cases on the basis of the EU Digital Identity Wallet.

    It is expected to be presented as a joint best practice at the next OECD Ministerial meeting on 2 and 3 May 2024.

    In line with the Memorandum of Cooperation on submarine cables for sustainable global connectivity signed on 3 July 2023, the EU and Japan reconfirmed the importance of deploying resilient submarine cable infrastructures.

    The partners will continue to develop direct connectivity links between Europe and Japan to promote commercial opportunities and oceanographic research.

    Collaborative research projects for a digital transformation

    The EU and Japan confirmed that they will continue their collaboration on high-performance computing and have identified hybrid Quantum-HPC applications and use cases for further work.

    Cooperation on basic research in quantum and joint cybersecurity projects was also discussed at the Council.

    The EU and Japan have launched collaborative 6G research projects and intend to support global standardisation initiatives, which are crucial for developing 6G technologies.

    The partners reaffirmed their shared vision for open and resilient networks at the council.

    Shaping a trustworthy AI global governance

    In addition, the partners announced their intention to enhance cooperation between the EU AI Office and Japan’s AI Safety Institute. The G7 Hiroshima AI Process and Code of Conduct will continue to be supported to shape AI global governance.

    The EU encouraged Japanese companies to participate in the AI Pact launched by the Commission. Japanese participation will help foster early compliance with key provisions of the AI Act on a voluntary basis before it enters into force.

    The next Digital Partnership Council is set to be held in 2025 in Tokyo, Japan.

    [ad_2]

    Source link

  • European Commission to invest €112m in AI and quantum research

    European Commission to invest €112m in AI and quantum research

    [ad_1]

    The European Commission has launched calls for proposals for AI and quantum research.

    The proposals for AI and quantum research fall under Horizon Europe’s 2023-2024 digital, industrial and space work programme.

    The Commission has previously stated the importance of these technologies by reinforcing quantum value chains and introducing the AI Act, which guarantees the safety of this growing technology.

    Enhancing AI applicability across new sectors

    The Commission will invest over €65m in AI. Of this amount, €50m will be dedicated to projects to develop new ways of combining data and expanding the capabilities of large AI models.

    These efforts will enhance AI applicability across new domains and support Europe’s research excellence in this field.

    Another €15m will be invested in developing robust and transparent AI systems. Projects will aim to enhance AI systems’ reliability and provide meaningful insights into their decision-making processes.

    The above investments will help develop AI technology that aligns with the AI Act and the human-centric European approach to AI.

    The next generation of quantum technology

    Additionally, €40m will be invested to boost research into cutting-edge, world-leading quantum technologies, of which €25m will be invested for the creation of a pan-European network of quantum gravimeters (gravity sensors).

    The network will provide high-precision gravity measurements, important for various sectors like Earth observation and civil engineering.

    Another €15m will be invested in translational research and development projects in the field of next-generation quantum technologies.

    This cooperation aims to ensure that the EU remains at the forefront of the global quantum technology race.

    Furthermore, another €7.5m will be devoted to projects that support European values, put people at the centre of the digital transformation, and increase the EU’s influence in global ICT standardisation.

    More information on grant applications for calls and proposals for AI and quantum research can be found here.

    [ad_2]

    Source link

  • PsiQuantum: Australia places A$1 billion bet on quantum computing

    PsiQuantum: Australia places A$1 billion bet on quantum computing

    [ad_1]

    A silicon photonic chip from PsiQuantum

    PsiQuantum

    The Australian government has announced it will invest nearly A$1 billion into the development of quantum computers, staking a claim in a race currently dominated by the US and China.

    PsiQuantum, which is headquartered in the US but was co-founded by a team including two Australian researchers, will get A$470 million from both Australia’s federal government and the state government of Queensland, totalling A$940m ($613m). In return, the company will build and operate successive generations of its quantum computers in Brisbane, Australia.

    Stephen Bartlett at the University of Sydney says the announcement amounts to Australia staking a claim to sovereign capability in quantum computing and building up a quantum technology ecosystem.

    “What gets me really excited about this is that the scale of investment means we are serious,” says Bartlett. While big technology companies like IBM, Google and Microsoft have made multi-billion dollar investments in quantum computing, Australia’s funding makes PsiQuantum one of the biggest dedicated quantum computing companies in the world.

    Quantum computers offer the potential to complete some tasks much faster than any ordinary computer. To date, such capabilities have only been demonstrated on problems with no practical applications, but as research teams in the US, China and elsewhere race to build larger and less error-prone machines, the hope is they will start proving useful.

    While many teams are building quantum computers based on superconductors, PsiQuantum’s approach involves particles of light called photons, a method which had been seen as difficult to scale up. But ahead of the Australian announcement, PsiQuantum published a paper detailing how it has been able to use a standard semiconductor fabrication set-up, of the type used to make ordinary computer chips, to build the photonic chips it needs for quantum machines.

    Australia has exported a generation of quantum researchers, including PsiQuantum co-founders Jeremy O’Brien and Terry Rudolph. The government investment may entice such scientists to begin returning and building careers in Australia, says Bartlett. “Australia is saying we are going to sit at the big table when it comes to quantum computing.”

    Topics:

    • Australia/
    • quantum computing

    [ad_2]

    Source link

  • UK research advances tsunami warning systems and quantum tech

    UK research advances tsunami warning systems and quantum tech

    [ad_1]

    A collaborative project between the UK and New Zealand is set to create an advanced earthquake and tsunami warning system.

    The £750,000 joint research project will leverage underwater fibre optic cables to improve earthquake and tsunami warning capabilities, an innovation that could benefit millions worldwide.

    The project could revolutionise ocean monitoring, providing coastal communities with extra time to prepare for devastating natural disasters.

    The agreement will be announced at the OECD Committee for Scientific and Technological Policy Ministerial in Paris.

    Additionally, the UK will also announce a partnership with Denmark at the OECD to combine efforts in quantum technology research and innovation.

    UK Science Minister Andrew Griffith said: “Global issues require global collaboration, which is why we need to build more and stronger partnerships on science and research with like-minded nations, just like the ones I am delighted to announce with New Zealand and Denmark today.

    “That shared endeavour is precisely what we will focus on with colleagues from across the OECD to ensure we can all benefit from the improvements to health and wealth that science and innovation promise to deliver.

    “Bringing the UK and New Zealand’s brightest minds together to overhaul how we give crucial advance warning of tsunamis could save thousands of lives.

    “This work proves the value of breakthrough technologies like quantum, and the international teamwork is crucial to harnessing them. The UK’s plans for closer work together on quantum with Denmark reinforces this even further.”

    Why early tsunami warning systems are essential

    Tsunamis, massive waves triggered by underwater earthquakes or landslides, pose a serious threat to coastal communities. Early tsunami warning systems are vital lifelines in these regions, offering precious time for evacuation and preparation.

    Every minute gained is critical, as tsunamis can travel incredibly fast and strike with devastating force. The effectiveness of tsunami warning systems is undeniable.

    Studies show a clear link between early warnings and reduced death tolls. In the aftermath of the 2004 Indian Ocean tsunami, for instance, regions with established warning systems fared significantly better.

    Beyond saving lives, these systems also minimise property damage and economic loss. Timely evacuations allow people to move valuables and secure their homes. This translates to faster recovery and a smoother return to normalcy after the disaster.

    Advancing natural disaster preparedness

    The UK will invest £750,000 via the International Science Partnerships Fund to enable collaboration between UK and New Zealand researchers.

    The project will focus on evolving technology developed at the UK’s National Physical Laboratory (NPL) involving quantum systems.

    The technique utilises telecommunication fibre optic cables already installed in the seabed to detect earthquakes and ocean currents in a method known as optical interferometry.

    © shutterstock/Laiotz

    The initiative will explore whether these cables can accurately provide an early tsunami warning to coastal communities when tremors occur.

    The technology will be trialled between Australia and New Zealand in the Pacific Ocean – an area where earthquakes and tsunamis are common.

    A previous study using a fibre optic cable running almost 6,000 kilometres from the UK to Canada demonstrated the technology’s success.

    Investing in quantum research

    Expanding its global quantum research network, the UK will also solidify its ties with Denmark in Paris through the signing of a Memorandum of Understanding (MoU).

    Denmark’s prominence in quantum research makes it an ideal partner for the UK. Strengthening this collaboration will offer researchers from both nations optimal prospects to engage in groundbreaking projects, particularly in fields like transportation and life sciences.

    Denmark Minister of Higher Education and Science, Christina Egelund, added: “The UK is a very attractive partner in the quantum field, with world-class research environments and great investments.

    “With the new MoU, we are bringing Denmark’s quantum strategy to a higher international level. Quantum technology holds enormous potential to provide us with solutions in virtually every imaginable area, but it requires large investments and strong collaboration.

    “For a small open economy such as Denmark, it is crucial to cooperate with the world’s leading countries. Both when it comes to talent exchange, research, innovation, commercialisation, security and defence.

    “Therefore, I am very pleased that Denmark and the UK will now initiate an even closer collaboration on quantum technology.”

    [ad_2]

    Source link

  • Investigating the impact of cosmic rays on quantum technologies

    Investigating the impact of cosmic rays on quantum technologies

    [ad_1]

    A new collaboration project has been awarded funding to analyse how radiation and cosmic rays impact quantum technologies, focusing on the occurrence of errors in qubits.

    Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo, SNOLAB near Sudbury, Ontario, and Chalmers University of Technology in Sweden have been awarded a new grant to analyse the impact of radiation and cosmic rays on quantum technologies.

    The research grant, ‘Advanced Characterisation and Mitigation of Qubit Decoherence in a Deep Underground Environment,’ is sponsored by the Army Research Office, a directorate of the U.S. Combat Capabilities Development Command’s Army Research Laboratory.

    It was awarded to Dr Chris Wilson, faculty member at IQC and professor in Waterloo’s Department of Electrical and Computer Engineering, along with Dr Jeter Hall, Director of Research at SNOLAB and adjunct professor at Laurentian University, and Dr Per Delsing, professor at Chalmers University of Technology and director of the Wallenberg Center for Quantum Technology.

    Wilson said: “By partnering with the experts in dark matter and cosmic radiation at SNOLAB, we can bring together their expertise and strengths with the superconducting qubit skills we have at IQC and Chalmers.”

    What is the impact of cosmic rays on quantum technologies?

    The team plans to examine the link between cosmic rays and qubits – a fundamental part of quantum technologies.

    Experiments have shown that one source of errors in qubits is being hit by a high-energy particle, such as a cosmic ray.

    This causes an error hotspot, which spreads to neighbouring qubits. It has happened at a rate of around once every ten seconds, setting an upper limit on quantum calculation time.

    Decoherence: Where qubits lose their quantum states

    Like classical computers, most of the leading quantum error correction methods assume that each error is completely independent.

    In superconducting qubit processors, the assumption of uncorrelated errors doesn’t hold true. Occasionally, all the qubits will error in response to radiation.

    This gives rise to a challenge known as decoherence.

    Advantages of using SNOLAB for the research

    Built two kilometres underground in Vale’s Creighton mine, SNOLAB is the world’s deepest cleanroom.

    The laboratory shields scientific experiments from high-energy particles from space, using the Canadian Shield to create a low background environment.

    The environment allows the team to isolate qubits from cosmic radiation, helping to shed light on cosmic rays’ impacts on quantum technologies.

    “SNOLAB maintains the lowest muon flux in the world and advanced cryogenics testing capabilities, making it an ideal place to conduct valuable research on quantum technologies,” said Hall.

    High-quality superconducting qubits will be manufactured in the fabrication facilities at Chalmers University. They will then be tested at the surface in Sweden and Waterloo and underground at SNOLAB to explore the differences in each environment.

    “We are super excited about this project, since it addresses the very important issue of how cosmic radiation affects quantum bits and quantum processors. Getting access to the underground facility at SNOLAB is crucial to understanding how the effects of cosmic radiation can be mitigated,” concluded Delsing.

    [ad_2]

    Source link