Abstract
We study a class of finite dimensional quantum dynamical semigroups \(\{\mathrm {e}^{t\mathcal{L}}\}_{t\geq0}\) whose generators \(\mathcal{L}\) are sums of Lindbladians satisfying the detailed balance condition. Such semigroups arise in the weak coupling (van Hove) limit of Hamiltonian dynamical systems describing open quantum systems out of equilibrium. We prove a general entropic fluctuation theorem for this class of semigroups by relating the cumulant generating function of entropy transport to the spectrum of a family of deformations of the generator \({\mathcal{L}}\). We show that, besides the celebrated Evans-Searles symmetry, this cumulant generating function also satisfies the translation symmetry recently discovered by Andrieux et al., and that in the linear regime near equilibrium these two symmetries yield Kubo’s and Onsager’s linear response relations.
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Notes
The name quantum Markov semigroup is also used in the literature.
The level sets of I are {ς | I(ς)≤l} where l∈[0,∞[.
The derivative exists for all \(\rho\in \mathfrak{S}\), see Theorem 3 in [60].
This does not imply that L jk =L kj .
Here, we could also consider conserved charges and introduce associated chemical potentials. We refrain to do so in order to keep notation as simple as possible.
In some models (like the spin-boson system) the operators \(R^{(k)}_{j}\) are unbounded and only affiliated to the W ∗-algebra \(\mathcal{O}_{j}\). With some additional technicalities the discussions of this and the next three section easily extend to such cases, see any of the references [15, 17, 19, 41, 48].
The same conditions ensure that the terms \(\rho_{\beta_{0}}(D_{j}(H_{\mathcal{S}}, H_{\mathcal{S}}))\) in Theorem 3.5(1) are strictly positive, providing of course that .
At the current level of generality, the verification of Hypothesis (RE) requires supplementing Davies’ conditions with additional regularity assumptions which we shall not discuss for reasons of space. In practice, i.e. in the context of concrete models, the verification of (RE) is typically an easy exercise.
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Dedicated to Herbert Spohn on the occasion of his 65th birthday.
The research of V.J. was partly supported by NSERC. The research of C.-A.P. was partly supported by ANR (grant 09-BLAN-0098). C.-A.P. is also grateful to the Department of Mathematics and Statistics at McGill University and to CRM (CNRS–UMI 3457) for hospitality and generous support during his stay in Montreal where most of this work was done. We are grateful to J. Dereziński, B. Landon, and A. Panati for useful comments. We also thank C. Maes and W. de Roeck for interesting related discussions.
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Jakšić, V., Pillet, CA. & Westrich, M. Entropic Fluctuations of Quantum Dynamical Semigroups. J Stat Phys 154, 153–187 (2014). https://doi.org/10.1007/s10955-013-0826-5
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DOI: https://doi.org/10.1007/s10955-013-0826-5