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Stochastic Approach to Quantum Spin Dynamics

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If you have a question about this talk, please contact Katarzyna Macieszczak .

We investigate a stochastic approach to non-equilibrium quantum spin systems based on links between quantum and classical dynamics. Exploiting a sequence of exact transformations, quantum expectation values can be recast as averages over classical stochastic processes. We illustrate this approach for the quantum Ising model by extracting the Loschmidt amplitude and the magnetization dynamics from the numerical solution of stochastic differential equations. We show that dynamical quantum phase transitions are accompanied by clear signatures in the associated classical distribution functions, including the presence of enhanced fluctuations. We demonstrate that the method is capable of handling integrable and non-integrable problems in a unified framework, including those in higher dimensions.

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https://maths-cam-ac-uk.zoom.us/j/92247943806?pwd=ZVNiZWJ2bGFubEYzMmVWdGE5MUd5UT09 Whipple Museum of the History of Science, Free School Lane Principal's Lodge, Newnham College

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