Variational preparation of finite-temperature states on a quantum
computer
- URL: http://arxiv.org/abs/2012.03895v1
- Date: Mon, 7 Dec 2020 18:19:58 GMT
- Title: Variational preparation of finite-temperature states on a quantum
computer
- Authors: R. Sagastizabal, S. P. Premaratne, B. A. Klaver, M. A. Rol, V.
Neg\^irneac, M. Moreira, X. Zou, S. Johri, N. Muthusubramanian, M. Beekman,
C. Zachariadis, V. P. Ostroukh, N. Haider, A. Bruno, A. Y. Matsuura, and L.
DiCarlo
- Abstract summary: Preparation of thermal equilibrium states is important for the simulation of condensed-matter and cosmology systems.
We present a method to prepare such mixed states with unitary operators, and demonstrate this technique experimentally using a gate-based quantum processor.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The preparation of thermal equilibrium states is important for the simulation
of condensed-matter and cosmology systems using a quantum computer. We present
a method to prepare such mixed states with unitary operators, and demonstrate
this technique experimentally using a gate-based quantum processor. Our method
targets the generation of thermofield double states using a hybrid
quantum-classical variational approach motivated by quantum-approximate
optimization algorithms, without prior calculation of optimal variational
parameters by numerical simulation. The fidelity of generated states to the
thermal-equilibrium state smoothly varies from 99 to 75% between infinite and
near-zero simulated temperature, in quantitative agreement with numerical
simulations of the noisy quantum processor with error parameters drawn from
experiment.
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