Séminaire du LPTMS : Adam Nahum (LPENS)
Quantum dynamics with an observer: the measurement phase transition
Adam Nahum (Laboratoire de Physique de l’Ecole Normale Supérieure)
Onsite seminar + zoom.
Zoom link:
https://cnrs.zoom.us/j/92283605429?pwd=ZTRuWmR4T0dHVWh2M0VRUzhrc2p6QT09
Meeting ID: 922 8360 5429
Passcode: vv58du
In the quantum world, measurements inevitably affect the state of a system, via wavefunction collapse. This means that the dynamics of a system which is continually being monitored by an observer is fundamentally different from the dynamics of a closed system. In particular, for a spatially extended system, local measurements of the degrees of freedom can “compete” with chaotic dynamics: while chaotic dynamics tends to produce complex, entangled quantum wavefunctions, local measurements tend to collapse the wavefunction into something simpler. I will describe how this leads to a dynamical phase transition between a weak monitoring phase, where the state is complex and entangled, and a strong monitoring phase, where the state is simple and “classical”. I will sketch the relevance of this transition to the classical simulation of quantum dynamics, and some theoretical approaches to understanding the transition.
Date/Time : 15/02/2022 - 11:00 - 12:00
Location : Petit amphi, bâtiment Pascal n° 530
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