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Symmetry Protected Topological Order in Open Quantum Systems

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If you have a question about this talk, please contact Dr Hannah Price.

I will discuss recent work with Caroline de Groot and Norbert Schuch, in which we systematically investigate the robustness of symmetry protected topological (SPT) order in open quantum systems by studying the evolution of string order parameters and other probes under noisy channels. We find that one-dimensional SPT order is robust against noisy couplings to the environment that satisfy a strong symmetry condition, while it is destabilized by noise that satisfies only a weak symmetry condition, which generalizes the notion of symmetry for closed systems. We also discuss “transmutation” of SPT phases into other SPT phases of equal or lesser complexity, under noisy channels that satisfy twisted versions of the strong symmetry condition.

This talk is part of the Theoretical Physics Seminars series.

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