3:00 pm MCP 201
“Quantum Information Capsules and Generalized Partners in Condensed Matters and Quantum Fields”
Entangled many-body systems and quantum fields are capable of playing a role of quantum memory storage. When unknown parameters are imprinted to one subsystem by a fixed local unitary operation, we have three different quantum pictures for storing the information, Schmidt partner (ordinary partner), generalized partner, and quantum information capsule. In the first part of this talk, we will argue a counter-intuitive phenomenon of multiple qudits. Strong chaos generated by fast scrambling at high temperature yields an ordered information storage structure with decoupled quantum information capsules. A rotational isometry emerges in quantum Fisher information matrices. In the second part of this talk, I will provide a general formula of a purification partner mode associated with a particle mode detected by a generalized Unruh-DeWitt particle detector in quantum field theory. For particle creation processes by expanding universes and moving mirrors, we will discuss how a quantum field stores information of the expanding parameter and mirror trajectories in a detected particle and its partner. The moving mirror results may be expected to be checked by future experiments in quantum optics.