World News – USA – Bristol researchers publish significant step towards quantum advantage

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Dec. . Nov 11, 2020 – Researchers from the University of Bristol and quantum start-up Phasecraft have advanced quantum computing research and brought practical hybrid quantum classical computing one step closer.

The team, led by Bristol researcher and Phasecraft co-founder, Dr. . Ashley Montanaro has discovered algorithms and analysis that significantly reduce the quantum hardware capability required to solve problems beyond the realm of classical computing, even of supercomputers.

In the article published in Physical Review B, the team shows how optimized quantum algorithms can solve instances of the infamous Fermi-Hubbard model on short-term hardware.

The Fermi-Hubbard model is fundamental in condensed matter physics as a model for highly correlated materials and as a way of understanding high temperature superconductivity.

Finding the ground state of the Fermi-Hubbard model has been predicted to be one of the earliest applications of short-term quantum computers, and to provide a pathway to understanding and developing novel materials.

Dr. . Ashley Montanaro, Head of Research and Co-Founder of Phasecraft: “Quantum Computing has important applications in materials science and other areas. Despite the great advances in quantum hardware of late, we may still be a few years away from having the right software and hardware to solve significant quantum computing problems. Our research focuses on algorithms and software optimizations to maximize the capacity of quantum hardware and bring quantum computing closer to reality.

“Short-term quantum hardware has a limited device and computing size. Phasecraft used new theoretical ideas and numerical experiments to put together a very comprehensive study of various strategies for solving the Fermi-Hubbard model, focusing on strategies that are likely to have the best results and impact in the near future.

Lana Mineh, a PhD student at the Faculty of Mathematics and the Center for PhD Education in Quantum Engineering, who played a key role in the research, said, “The results suggest that optimization over quantum circuits with gate depth is much less more than a thousand could be enough to solve instances of the Fermi-Hubbard model that are beyond the capacity of current supercomputers. This new research shows promising prospects for generating the ground state of the model on short-term quantum devices and improves previous research by about a factor of 10. ”

Physical Review B, published by the American Physical Society, is the top journal for solid state physics. The research paper, examined by experts, was also selected as a suggestion by the editorial team and appears in the physics magazine.

Andrew Childs, Professor in the Department of Computer Science and Department of Advanced Computing Studies at the University of Maryland: “The Fermi-Hubbard model is a major challenge in condensed matter physics, and the Phasecraft team has taken impressive steps to show how quantum computers could solve it. Their work suggests that circuits of surprisingly shallow depth could provide useful information about this model and make it more accessible to realistic quantum hardware. ”

Hartmut Neven, Head of the Quantum Artificial Intelligence Lab at Google: “Sooner or later, quantum computing will come. Developing algorithms and technologies for the first commercial applications of early quantum computer hardware is the greatest challenge in this area that few are willing to face. We are proud to partner with Phasecraft, a team that creates advances in quantum software that could cut that time frame by years. ”

Phasecraft co-founder Dr. . Toby Cubitt: “At Phasecraft, our team of leading quantum theorists has researched and applied quantum theory for decades and leads some of the world’s leading academic teams and research in the field. Today Ashley and his team showed ways to get closer to new possibilities that only exist beyond today’s technological boundaries. ”

Phasecraft closed a record round for a quantum company in the UK for £ 3. 7 million. in funding for private VC investors, led by LocalGlobe with Episode1 along with previous investors. Former Songkick founder Ian Hogarth is also Phasecraft’s CEO. Phasecraft previously had a pre-seed round worth 750, led by the UCL Technology Fund. Raised £ 000 with Parkwalk Advisors and the London Co-Investment Fund and received multiple InnovateUK supported grants. Between equity funding and research grants, Phasecraft has raised more than £ 5. 5 m.

Dr. . Toby Cubitt: “With new resources and support, we can continue our groundbreaking research and industry collaborations to develop the quantum computing industry and find useful applications more quickly. ”

« Strategies for Solving the Fermi-Hubbard Model on Short-Term Quantum Computers » by Cade, C. . , Mineh, L. . , Montanaro, A. . and Stanisic, S. . in physical examination B. .

The Bristol Quantum Information Institute has long been a leader in growing global activity in the field, crystallizing our research across the spectrum from theory to technology. With our interdisciplinary team of experts, including the founders of the department, we have specialist knowledge in all important areas of theoretical quantum information science and in experiment. We have partnerships with the private sector and provide excellent teaching and training for the future generation of quantum scientists and engineers, as well as for the prototypes of tomorrow.

Bristol’s EPSRC-funded Quantum Engineering Center for Doctoral Education provides an exceptional training and development experience for those pursuing careers in the emerging quantum technology industry or in academia. It supports the understanding of sound basic scientific principles and their practical application to real challenges.

Since its inception in 2019, Phasecraft has established itself as an emerging market leader in quantum research. It was developed by leading quantum scientist Dr. Toby Cubitt, Dr. Ashley Montanaro and Prof. John Morton, who have led top research teams at UCL and the University of Bristol for decades. Together they have built a team that enables short-term applications of the quantum computer by developing highly efficient algorithms to optimize the capabilities of short-term quantum hardware. Phasecraft works with leading quantum hardware companies including Google and Rigetti, academic and industry leaders, to create highly efficient software that takes quantum computing from experimental demonstrations to useful applications.

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Quantum computers, quantum mechanics, computers, research