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Measuring large deviation statistics in open quantum systems

Lunedi 13 gennaio 2020, alle ore 11:30 in Laboratorio Zironi, Edificio Matematica, Dipartimento FIM, Modena

Relatore: Dott. Carlos Perez Espigares (Università di Granada)

Abstract: Controlling dynamical fluctuations in open quantum systems is essential both for our comprehension of quantum nonequilibrium behaviour and for its possible application in near-term quantum technologies. However, understanding these fluctuations is extremely challenging due, to a large extent, to a lack of efficient numerical methods. In this talk, we shall introduce a unified framework --based on population-dynamics methods-- for the evaluation of the full probability distribution of generic time-integrated observables in Markovian quantum jump processes. These include quantities carrying information about genuine quantum features, such as quantum superposition or entanglement. The algorithm we propose provides dynamical free-energy and entropy functionals which, akin to their equilibrium counterpart, permit to unveil intriguing phase-transition behaviour in quantum trajectories. We shall discuss some applications and further disclose coexistence and hysteresis, between a highly entangled phase and a low entangled one, in large fluctuations of a strongly interacting few-body system.

Host: C. Giardina' (cristian.giardina@unimore.it)

[Ultimo aggiornamento: 01/04/2021 11:34:32]