Work

Mixed State Variational Quantum Eigensolver for the Estimation of Expectation Values at Finite Temperature

Year: 2024

Type: conference-paper

Abstract: We introduce a novel hybrid quantum-classical algorithm for the near-term computation of expectation values in quantum systems at finite temperatures. This is based on two stages: on the first one, a mixed state approximating a fiducial truncated density matrix is prepared through Variational Quantum Eigensolving (VQE) techniques; this is then followed by a reweighting stage where the expectation values for observables of interest are computed. These two stages can then be iterated again with different hyperparameters to achieve arbitrary accuracy. Resource and time scalability of the algorithm is discussed with a near-term perspective.

Source: International Symposium on Lattice Field Theory (LATTICE)

DOI: 10.22323/1.453.0216

Author: Giuseppe Clemente

Institutions: Istituto Nazionale di Fisica Nucleare, Deutsches Elektronen-Synchrotron DESY, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

Language: English

Topic: Quantum Computing Algorithms and Architecture

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W4396678618

FWCI: 0.294

Cites: 33

Cited by: 1

Related to: 10