Real-time simulation of large open quantum spin systems driven by dissipation

Banerjee, Debasish; Jiang, F.-J.; Kon, M.; Wiese, Uwe-Jens (2014). Real-time simulation of large open quantum spin systems driven by dissipation. Physical review. B - condensed matter and materials physics, 90(24) American Physical Society 10.1103/PhysRevB.90.241104

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We consider a large quantum system with spins 12 whose dynamics is driven entirely by measurements of the total spin of spin pairs. This gives rise to a dissipative coupling to the environment. When one averages over the measurement results, the corresponding real-time path integral does not suffer from a sign problem. Using an efficient cluster algorithm, we study the real-time evolution from an initial antiferromagnetic state of the two-dimensional Heisenberg model, which is driven to a disordered phase, not by a Hamiltonian, but by sporadic measurements or by continuous Lindblad evolution.

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