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QI: Fachverband Quanteninformation

QI 29: Quantum Thermodynamics and Open Quantum Systems II

QI 29.7: Vortrag

Donnerstag, 9. März 2023, 16:00–16:15, B302

Measurement feedback models of friction beyond the diffusive limit — •Michael Gaida and Stefan Nimmrichter — Universität Siegen, Deutschland

A typical approach to open quantum systems of motional degrees of freedom is often described in the limit of Brownian motion, which naturally arises from either weak coupling to thermal environments or from weak continuous monitoring.

Here we go beyond the diffusive description and provide a general Markovian measurement feedback model for friction: It involves randomly occur- ring POVM measurements of momentum combined with unitary feedback operations. This enables us to describe arbitrary linear or nonlinear friction forces for quantum particles and quantum op- tomechanical systems.

For linear friction, we find that our model is equivalent to a random position measurement feedback process involving squeezing. Moreover, we highlight the connection to dissipative spontaneous collapse models.