Hidden time-reversal symmetry, quantum detailed balance and exact solutions of driven-dissipative quantum systems

TL;DR

This paper reveals a hidden time-reversal symmetry in driven-dissipative quantum systems, enabling exact solutions for steady states and showing observable consequences, even when traditional detailed balance does not hold.

Contribution

It introduces the concept of hidden time-reversal symmetry in quantum systems and demonstrates its utility in solving for steady states and understanding system behavior.

Findings

Hidden TRS can be present without conventional detailed balance.

The approach includes methods like quantum absorber and complex-P functions.

Hidden TRS has observable effects and can be broken by nonlinearity and fluctuations.

Abstract

Driven-dissipative quantum systems generically do not satisfy simple notions of detailed balance based on the time symmetry of correlation functions. We show that such systems can nonetheless exhibit a hidden time-reversal symmetry which most directly manifests itself in a doubled version of the original system prepared in an appropriate entangled thermofield double state. This hidden time-reversal symmetry has a direct operational utility: it provides a general method for finding exact solutions of non-trivial steady states. Special cases of this approach include the coherent quantum absorber and complex-$P$ function methods from quantum optics. We also show that hidden TRS has observable consequences even in single-system experiments, and can be broken by the non-trivial combination of nonlinearity, thermal fluctuations, and driving. To illustrate our ideas, we analyze concrete examples of driven qubits and nonlinear cavities. These systems exhibit hidden time-reversal symmetry but not conventional detailed balance.