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Digital quantum simulation framework for energy transport in an open quantum system

Gupta, P and Chandrashekar, CM (2020) Digital quantum simulation framework for energy transport in an open quantum system. In: New Journal of Physics, 22 (12).

Gupta_2020_New_J._Phys._22_12.pdf - Published Version

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Official URL: https://dx.doi.org/10.1088/1367-2630/abcdc9


Quantum effects such as the environment assisted quantum transport (ENAQT) displayed in photosynthetic Fenna�Mathews�Olson (FMO) complex has been simulated on analog quantum simulators. Digital quantum simulations offer greater universality and flexibility over analog simulations. However, digital quantum simulations of open quantum systems face a theoretical challenge; one does not know the solutions of the continuous time master equation for developing quantum gate operators. We give a theoretical framework for digital quantum simulation of ENAQT by introducing new quantum evolution operators. We develop the dynamical equation for the operators and prove that it is an analytical solution of the master equation. As an example, using the dynamical equations, we simulate the FMO complex in the digital setting, reproducing theoretical and experimental evidence of the dynamics. The framework gives an optimal method for quantum circuit implementation, giving a log reduction in complexity over known methods. The generic framework can be extrapolated to study other open quantum systems. © 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.

Item Type: Journal Article
Publication: New Journal of Physics
Publisher: IOP Publishing Ltd
Additional Information: Copyright to this article belongs to IOP Publishing Ltd
Keywords: Continuous time systems; Quantum optics, Analog simulations; Dynamical equation; Experimental evidence; Generic frameworks; Open quantum systems; Quantum simulations; Quantum simulators; Theoretical framework, Quantum chemistry
Department/Centre: Division of Physical & Mathematical Sciences > Mathematics
Date Deposited: 27 Jan 2021 11:36
Last Modified: 27 Jan 2021 11:36
URI: http://eprints.iisc.ac.in/id/eprint/67836

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