Open Quantum Symmetric Simple Exclusion Process
arXiv:1904.01406 · doi:10.1103/PhysRevLett.123.080601
Abstract
We introduce and solve a model of fermions hopping between neighbouring sites on a line with random Brownian amplitudes and open boundary conditions driving the system out of equilibrium. The average dynamics reduces to that of the symmetric simple exclusion process. However, the full distribution encodes for a richer behaviour entailing fluctuating quantum coherences which survive in the steady limit. We determine exactly the system state steady distribution. We show that these out of equilibrium quantum fluctuations fulfil a large deviation principle and we present a method to recursively compute exactly the large deviation function. On the way, our approach gives a solution of the classical symmetric simple exclusion process using fermion technology. Our results open the route towards the extension of the macroscopic fluctuation theory to many body quantum systems.
arXiv comment5 pages + SM, 2 figures
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