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Thursday, May 13, 2021
1:30 PM - 2:30 PM
WebEx

Quantum Lunch

Solving the Fermi-Hubbard model on near-term quantum computers

Ashley Montanaro
(Co-founder of the quantum software startup Phasecraft and Professor of Quantum Computation at the University of Bristol)

*** PLEASE NOTE TIME CHANGE FOR THIS WEBEX ***The Fermi-Hubbard model is of fundamental importance in condensed-matter physics, yet is extremely challenging to solve numerically. Finding the ground state of the Hubbard model using variational methods has been predicted to be one of the first applications of near-term quantum computers. In this talk, I will discuss several recent works on this topic: a detailed analysis and optimisation of the complexity of variational quantum algorithms for finding the ground state of the Hubbard model, including extensive numerical experiments for systems with up to 12 sites; a proof-of-principle implementation on Rigetti quantum computing hardware; and an error-mitigation technique based on classical simulability of fermionic linear optics circuits.The talk is based on joint work with Chris Cade, Lana Mineh and Stasja Stanisic [ arXiv:1912.06007 (Phys. Rev. B 102, 235122), arXiv:2006.01179 , arXiv:2102.02120 ]