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Non-reciprocal population dynamics in a quantum trimer.

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Bibliographic Details
Title: Non-reciprocal population dynamics in a quantum trimer.
Authors: Downing, C. A.1, Zueco, D.2
Source: Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences. Nov2021, Vol. 477 Issue 2255, p1-17. 17p.
Subjects: Population dynamics, Quantum theory, Coupling constants, Magnetic fields
Abstract: We study a quantum trimer of coupled two-level systems beyond the single-excitation sector, where the coherent coupling constants are ornamented by a complex phase. Accounting for losses and gain in an open quantum systems approach, we show how the mean populations of the states in the system crucially depend on the accumulated phase in the trimer. Namely, for non-trivial accumulated phases, the population dynamics and the steady states display remarkable non-reciprocal behaviour in both the singly and doubly excited manifolds. Furthermore, while the directionality of the resultant chiral current is primarily determined by the accumulated phase in the loop, the sign of the flow may also change depending on the coupling strength and the amount of gain in the system. This directionality paves the way for experimental studies of chiral currents at the nanoscale, where the phases of the complex hopping parameters are modulated by magnetic or synthetic magnetic fields. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:We study a quantum trimer of coupled two-level systems beyond the single-excitation sector, where the coherent coupling constants are ornamented by a complex phase. Accounting for losses and gain in an open quantum systems approach, we show how the mean populations of the states in the system crucially depend on the accumulated phase in the trimer. Namely, for non-trivial accumulated phases, the population dynamics and the steady states display remarkable non-reciprocal behaviour in both the singly and doubly excited manifolds. Furthermore, while the directionality of the resultant chiral current is primarily determined by the accumulated phase in the loop, the sign of the flow may also change depending on the coupling strength and the amount of gain in the system. This directionality paves the way for experimental studies of chiral currents at the nanoscale, where the phases of the complex hopping parameters are modulated by magnetic or synthetic magnetic fields. [ABSTRACT FROM AUTHOR]
ISSN:13645021
DOI:10.1098/rspa.2021.0507