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research article

Variational quantum time evolution without the quantum geometric tensor

Gacon, Julien  
•
Nys, Jannes  
•
Rossi, Riccardo
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February 5, 2024
Physical Review Research

Realand imaginary -time quantum state evolutions are crucial in physics and chemistry for exploring quantum dynamics, preparing ground states, and computing thermodynamic observables. On near -term devices, variational quantum time evolution is a promising candidate for these tasks, as the required circuit model can be tailored to the available devices' capabilities. Due to the evaluation of the quantum geometric tensor (QGT), however, this approach quickly becomes infeasible for relevant system sizes. Here, we propose a dual formulation for variational time evolution, which replaces the calculation of the QGT by solving a fidelity -based optimization to compute updates to the dynamics in each time step. We demonstrate our algorithm for the time evolution of the Heisenberg Hamiltonian and show that it accurately reproduces the system dynamics at a fraction of the cost of standard variational quantum time evolution algorithms.

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Type
research article
DOI
10.1103/PhysRevResearch.6.013143
Web of Science ID

WOS:001170965400001

Author(s)
Gacon, Julien  
Nys, Jannes  
Rossi, Riccardo
Woerner, Stefan
Carleo, Giuseppe  
Date Issued

2024-02-05

Publisher

Amer Physical Soc

Published in
Physical Review Research
Volume

6

Issue

1

Article Number

013143

Subjects

Physical Sciences

•

Algorithms

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CQSL  
FunderGrant Number

SEFRI

MB22.00051

Available on Infoscience
March 18, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/206549
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