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Numerical evaluation and robustness of the quantum mean force Gibbs state

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arxiv 2112.08254 v1 pith:65KOJU4E submitted 2021-12-15 quant-ph cond-mat.mes-hall

Numerical evaluation and robustness of the quantum mean force Gibbs state

classification quant-ph cond-mat.mes-hall
keywords stategibbsnumericalforceimaginary-timemeanmethodpropagation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We introduce a numerical method to determine the Hamiltonian of Mean Force (HMF) Gibbs state for a quantum system strongly coupled to a reservoir. The method adapts the Time Evolving Matrix Product Operator (TEMPO) algorithm to imaginary time propagation. By comparing the real-time and imaginary-time propagation for a generalized spin-boson model, we confirm that the HMF Gibbs state correctly predicts the steady state. We show that the numerical dynamics match the polaron master equation at strong coupling. We illustrate the potential of the imaginary-time TEMPO approach by exploring reservoir-induced entanglement between qubits.

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