Title:Perturbative quantum simulation
Speaker: Jinzhao Sun Imperial College London
Time: 2023-06-20 16:00-2023-06-20 17:00
Venue:MMW-S527 or TencentMeeting: 334-302-054 (Password: 1984)


Approximation based on perturbation theory is the foundation for most of the quantitative predictions of quantum mechanics with broad applications in quantum many-body physics. Quantum computing provides an alternative to the perturbation paradigm. In this talk, I will introduce a perturbative approach which combines the complementary strengths of the two approaches, enabling the simulation of large quantum systems using fewer quantum resources. The use of a quantum processor alleviates the need to identify a solvable unperturbed Hamiltonian, while the introduction of perturbative coupling permits a quantum processor to simulate systems with larger sizes. I will present an explicit perturbative expansion that mimics the Dyson series expansion and involves only local unitary operations. I will then discuss its optimality over other expansions under certain conditions. This perturbative approach is benchmarked by simulating the interacting dynamics of representative quantum systems.

Short Bio:

Jinzhao Sun received his Ph.D. in physics from the University of Oxford, and received his B.Sc. in physics from Peking University. He joined Imperial College London in 2022 as a Research Associate. He has broad research interests in quantum computing, quantum many-body physics, quantum materials, and quantum information.