Measuring large deviation statistics in open quantum systems

Fecha: Miércoles 26 de Febrero .
Hora: 10:00 horas.
Lugar: Laboratorio de Física Computacional. Planta baja del Edificio de Física. Facultad de Ciencias

Ponente: Carlos Pérez-Espigares. Universidad de Granada.

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.

Organiza: grupo de Física Estadística de los Sistemas Complejos.