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Variational thermal quantum simulation via thermofield double states

Abstract:

We present a variational approach for quantum simulators to realize finite temperature Gibbs states by preparing thermofield double (TFD) states. Our protocol is motivated by the quantum approximate optimization algorithm (QAOA) and involves alternating time evolution between the Hamiltonian of interest and interactions which entangle the system and its auxiliary counterpart. As a simple example, we demonstrate that thermal states of the 1d classical Ising model at any temperature can be prep...

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Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1103/PhysRevLett.123.220502

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Institution:
University of Oxford
Department:
MATHEMATICAL INSTITUTE
Sub department:
Mathematical Institute
Role:
Author
ORCID:
0000-0001-6867-1407
Publisher:
American Physical Society
Journal:
Physical Review Letters More from this journal
Volume:
123
Issue:
12
Article number:
220502
Publication date:
2019-11-26
DOI:
Language:
English
Keywords:
Pubs id:
1189945
Local pid:
pubs:1189945
Deposit date:
2021-08-21

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