Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00176 : Compact quantum circuits of variational quantum eigensolver for quantum impurity models*
Presenter:
Rihito Sakurai
(Saitama University)
Authors:
Rihito Sakurai
(Saitama University)
Wataru Mizukami
(Center for Quantum Information and Quantum Biology, Osaka University)
Hiroshi Shinaoka
(Department of Physics, Saitama University)
Variational quantum algorithms combining quantum and classical computers have been proposed to solve the above models in polynomial time. However, solving realistic models with multiple correlated sites is still too expensive with a near-term quantum device due to many variational parameters, especially for the bath sites.
We propose compact, physically motivated ansatzes by taking advantage of the fact that there are no direct interactions/hopping between their bath sites. The proposed ansatzes can reduce variational parameters for the bath sites. Using a quantum circuit simulator, we benchmark the proposed ansatzes against conventional ones, such as the unitary coupled-cluster ansatzes and the hardware-friendly ansatzes. We will show that the proposed ansatzes can accurately describe the ground states of impurity models with one correlated site. If time is allowed, we will show the results of impurity models with two correlated impurity sites.
*This work was supported by JST, PRESTO Grants No. JPMJPR2012 and No. JPMJPR191A, Japan.
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