Simulation of the Dynamics of Many-Body Quantum Spin Systems Using Phase-Space Techniques

Abstract

We reformulate the full quantum dynamics of spin systems using a phase space representation based on SU(2) coherent states which generates an exact mapping of the dynamics of any spin system onto a set of stochastic differential equations. The new representation is superior in practice to an earlier phase space approach based on Schwinger bosons, with the numerical effort scaling only linearly with system size. By also implementing extrapolation techniques from quasiclassical equations to the full quantum limit, we are able to extend useful simulation times several fold. This approach is applicable in any dimension including cases where frustration is present in the spin system. The method is demonstrated by simulating quenches in the transverse field Ising model in one and two dimensions

15 pages, 11 figures

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Cited by in corpus (11)

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• Stochastic Differential Equations for Quantum Dynamics of Spin-Boson Networks
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• Stochastic correction to the Maxwell-Bloch equations via the positive $P$ representation
• Trajectory-Resolved Weiss Fields for Quantum Spin Dynamics