Phasecraft, a UK quantum software startup that emerged from UCL and the University of Bristol, publishes peer-reviewed research showing a significant improvement over previous techniques for simulating fermions on quantum computers

One of the most significant challenges in global R&D efforts for better energy technologies – efficient and accurate material simulation – could get one step closer to solving it, based on new techniques released by UK quantum software startup Phasecraft.

The new peer-reviewed study in the in Physical verification B Journal of the American Physical Society introduces a novel technique for modeling fermionic particles – such as electrons – that significantly reduces the quantum hardware resources required to run simulations.

Joel Klassen from Phasecraft, co-lead of the study, said: “One of the most exciting uses for quantum computing is simulating physical systems like materials. The use of new tools such as quantum computers to develop a better understanding of how the natural world works has often resulted in dramatic technological breakthroughs in the past. Our results reduce the resources required to run these simulations and bring this application closer to reality. “

“Many important areas such as chemistry and materials science deal with the dynamics of fermion particles in physical systems – in the form of electrons. Fermions are notoriously difficult to simulate on normal computers, so an efficient simulation on a quantum device would offer a faster way to solve tough problems in these research areas such as understanding high temperature superconductivity or improving the efficiency of chemical reactions, ”commented Charles Derby, a Phasecraft team member and PhD student at UCL who helped lead the research.

“Our compact representation of fermions surpasses all previous representations and improves memory usage and the algorithm size by at least 25% each – an important step towards realizing practical scientific applications on short-term quantum computers.”

Although quantum hardware has seen significant improvements in recent years, existing devices remain limited and prone to the accumulation of errors, and there is a gap between the performance of the hardware and the resources that the software requires. The new modeling technique not only helps to close this gap, but also has the additional advantage that errors in the calculation can be detected. The lead authors, together with their collaborators Toby Cubitt and Johannes Bausch from Phasecraft, explain how this additional function could be used to fix these errors.

Building on these findings, Phasecraft is conducting small-scale experiments to demonstrate these resource enhancements and error mitigation methods on quantum hardware, and is working with established industry partners to investigate how they can be applied to simulating battery material.

“Another convincing part of this new approach is the error detection and reduction integrated into the Fermion coding, which are particularly important for short-term, noisy quantum hardware,” explained Phasecraft consultant and researcher Johannes Bausch.

Phasecraft Co-Founder and Research Associate Toby Cubitt commented, “At Phasecraft, we want to accelerate the quantum benefit timeline. This new research continues our pioneering work in developing compact, resource-efficient, and error-resistant software designed for the limited capacity of short-term quantum hardware. By developing these new techniques that are aligned with the limits of quantum hardware, Phasecraft can enable potential breakthroughs in the areas of energy efficiency and storage, chemistry, and far beyond. ”


This new research complements previous research advances, including the representation of the Fermi-Hubbard model, which is also used in the Physical verification B Diary.

Quote: C. Derby, J. Klassen, J. Bausch, TS Cubitt, Compact Fermion To Qubit Encodings, Physical verification B, vol. 104, Iss. July 3-15, 2021. http: // www.doi.Organization/10.1103 /PhysRevB.104.035118

Read the Phasecraft insight here: https: // /Insight/quantum-simulations-of-fermionic-many-body-systems

More information on Phasecraft’s advances is available online here: http: // /insight

About Phasecraft

Phasecraft brings quantum theory from research to reality faster. Phasecraft was founded in 2019 by Toby Cubitt, Ashley Montanaro and John Morton, veteran quantum scientists who have led top research teams at UCL and the University of Bristol for decades. Phasecraft works with leading quantum hardware companies including Google, IBM and Rigetti, academic and industry leaders, to create highly efficient software that takes quantum computers from experimental demonstrations to useful applications. Find out more: http: // www.phasecraft.ok

https: // /News/phasecraft-more-efficient-method-of-modeling-electrons-in-materials


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