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It is well known that quantum feedback can alter the dynamics of open quantumsystems dramatically. In this paper, we show that non-ergodicity may be inducedthrough quantum feedback and resultantly create system dynamics that havelasting dependence on initial conditions. To demonstrate this, we consider anoptical cavity inside an instantaneous quantum feedback loop, which can beimplemented relatively easily in the laboratory. Non-ergodic quantum systemsare of interest for applications in quantum information processing, quantummetrology and quantum sensing and could potentially aid the design of thermalmachines whose efficiency is not limited by the laws of classicalthermodynamics.

Non-ergodicity in open quantum systems through quantum feedback