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Q-MAC regular meeting 2020 has been cancelled. 

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Q-MAC Extension on the grounds of excellence

Q-MAC Project has been successfully extended for 1 year

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Publication Detail / Abstract

G. Guarnieri, M. T. Mitchison, A. Purkayastha, D. Jaksch, B. Buca, J. Goold

Time periodicity from randomness in quantum systems

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Many complex systems can spontaneously oscillate under non-periodic forcing. Such self-oscillators are commonplace in biological and technological assemblies where temporal periodicity is needed, such as the beating of a human heart or the vibration of a cello string. While self-oscillation is well understood in classical non-linear systems and their quantized counterparts, the spontaneous emergence of periodicity in quantum systems without a semi-classical limit is more elusive. Here, we show that this behavior can emerge within the repeated-interaction description of open quantum systems. Specifically, we consider a many-body quantum system that undergoes dissipation due to sequential coupling with auxiliary systems at random times. We develop dynamical symmetry conditions that guarantee an oscillatory long-time state in this setting. Our rigorous results are illustrated with specific spin models, which could be implemented in trapped-ion quantum simulators.
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