Lower bounds to the spectral gap of Davies generators

Abstract

We construct lower bounds to the spectral gap of a family of Lindblad generators known as Davies maps. These maps describe the thermalization of quantum systems weakly coupled to a heat bath. The steady state of these systems is given by the Gibbs distribution with respect to the system Hamiltonian. The bounds can be evaluated explicitly, when the eigenbasis and the spectrum of the Hamiltonian is known. A crucial assumption is that the spectrum of the Hamiltonian is non-degenerate. Furthermore, we provide a counterexample to the conjecture, that the convergence rate is always determined by the gap of the associated Pauli master equation. We conclude, that the full dynamics of the Lindblad generator has to be considered. Finally, we present several physical example systems for which the bound to the spectral gap is evaluated.

24 pages, 5 figures

References in corpus (5)

• On thermalization in Kitaev's 2D model
• Quantum logarithmic Sobolev inequalities and rapid mixing
• Stability of local quantum dissipative systems
• Rapid mixing implies exponential decay of correlations
• Spectral convergence bounds for classical and quantum Markov processes

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