|
Résumé |
A quantum measurement apparatus (a detector) is an ambivalent object, existing at the quantum-classical boundary: It transforms quantum information into classical objective knowledge that is accessible to many observers. Meanwhile, generic isolated many-body systems are expected to scramble information, making it practically inaccessible.
In this talk I will discuss toy models exhibiting sharp transitions between the two behaviours. The models take the general form of quantum dynamics on an expanding lattice — akin to the mutliscale entanglement renormalisation Ansatz (MERA), or field theory on de Sitter spacetime — which generates scale invariant states. We show that an “encoding-revealing" transition takes place when the dimension of the lightest (non-identity) operator crosses the threshold d/2, d being the space dimension. We argue that the transition is accompanied by the appearance of non-Gaussian statistics.
Based on the publications
Phys. Rev. Lett. 132, 110201 (2024)
Phys. Rev. A 109, 032226 (2024)
and ongoing work.
|
