US 12,190,031 B2
Generalization of a quantum imaginary time evolution process and simulation by tensor networks
Mario Motta, San Jose, CA (US); Yuya Jeremy Ong, San Jose, CA (US); Barbara Anne Jones, Los Gatos, CA (US); and Joseph A. Latone, San Francisco, CA (US)
Assigned to INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed by International Business Machines Corporation, Armonk, NY (US)
Filed on Nov. 6, 2020, as Appl. No. 17/091,721.
Prior Publication US 2022/0147667 A1, May 12, 2022
Int. Cl. G06F 30/27 (2020.01); G06F 17/16 (2006.01); G06N 10/00 (2022.01); G06N 10/20 (2022.01); G06N 10/60 (2022.01)
CPC G06F 30/27 (2020.01) [G06N 10/00 (2019.01); G06F 17/16 (2013.01); G06N 10/20 (2022.01); G06N 10/60 (2022.01)] 15 Claims
OG exemplary drawing
 
1. A system, comprising:
a memory that stores computer executable components; and
a processor that executes at least one of the computer executable components that:
generalizes, with respect to a multi-body quantum system comprising at least one of a boson or a fermion, a quantum imaginary time evolution process to provide a quantum imaginary time evolution ansatz process, wherein the generalizing comprises:
associating a metric space of vertices to the multi-body quantum system,
for each vertex of the vertices, associate a respective set of orbitals,
for each orbital of the respective set of orbitals, associate a local Hilbert space with a respective defined number of dimensions and spin, Bose, Fermi type with a local basis comprised of a quantity of real-valued operators that is the respective defined number squared, and
generating a real-valued wavefunction that is based on an imaginary time evolution under a Hamiltonian that is a linear combination of a subset of the real-valued operators mapped onto a product of unitary operators; and
simulates, using at least one tensor network, the real-valued wavefunction of the multi-body quantum system, wherein the at least one tensor network represents the real-valued wavefunction and operator expansion coefficients of the linear combination of the subset of the real-valued operators with a predefined maximum bond to reduce memory employed by the system to store the real-valued wavefunction of the multi-body quantum system.