Observable and computable entanglement in timeConfirmed

by Zofia Adamska (Perimeter Institute for Theoretical Physics)

Wednesday Jan 14, 2026, 11:00 AM → 12:30 PM America/Toronto

PI/4-405 - Bob Room (Perimeter Institute for Theoretical Physics)

Entanglement is usually discussed in the context of two subsystems at a fixed time. A natural question is whether this notion can be meaningfully extended to subsystems at different time slices. In this talk, I will present a family of entanglement measures defined for time-separated subsystems. A key property of these quantities is that they bound time-separated correlation functions, in close analogy with bounds on spatial correlators in terms of mutual information. For relativistic quantum field theories, our definition agrees with the analytic continuation from spacelike to timelike separated regions. I will discuss measurement protocols, computations for the Ising chain and holographic theories, and the relation of these constructions to the recently introduced timelike pseudoentropy. Based on https://arxiv.org/abs/2502.12240 .