Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 73: Quantum Dynamics, Decoherence and Quantum Information (joint session DY/TT)

TT 73.5: Talk

Wednesday, March 14, 2018, 16:30–16:45, EB 107

Fidelity plateaux from correlated noise in cold-atom quantum simulators — •Scott R Taylor and Chris A Hooley — University of St Andrews, St Andrews, UK

We demonstrate that, in a quantum simulation protocol based on the Hubbard model, correlated noise in the Hubbard parameters leads to arbitrarily long plateaux in the state-preparation fidelity as a function of elapsed time. We argue that this correlated-noise scenario is the generic one in the cold-atom context, since all of the Hubbard-model parameters ultimately depend on the same set of lasers. We explain the formation of such a plateau using the Bloch-sphere representation, deriving analytical expressions for its start and end times and its height.