Physical Society Colloquium

The Fate of Entanglement

William Witczak-Krempa

Département de physique
Université de Montréal

Quantum entanglement is not only behind the emergence of novel properties in materials / matter, but it’s also a ressource for quantum computation. For multiple particles, purely collective types of entanglement exist but their detection, even theoretically, remains challenging. First, we shall present the basics of multiparty entanglement.

Second, we will argue that in matter, all forms of multiparty entanglement entirely disappear during the typical evolution of a system as it heats up, evolves in time, or as its parts become separated. We illustrate these phenomena with a pedagogical example: a frustrated molecular quantum magnet in and out of equilibrium. We end by showing how such fate can be avoided near measurement-induced dynamical phase transitions in quantum circuits / computers.