München 2019 – scientific programme
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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik
MP 2: Verschränkung und Quanteninformation
MP 2.1: Invited Talk
Monday, March 18, 2019, 16:15–16:55, HS 23
How entangled are quantum fields? — •Ko Sanders1, Stefan Hollands2, and Onirban Islam3 — 1Dublin City University, Dublin, Irland — 2Universität Leipzig — 3University of Leeds, Leeds, United Kingdom
Entanglement is a quintessential aspect of quantum physics and a key experimental resource, e.g. in quantum computing. It is the source of such counterintuitive phenomena as teleportation, where perhaps the most extreme case occurs in quantum field theory: the entanglement of the vacuum state allows us (theoretically) to teleport information even despite the absence of particles.
The amount of entanglement that is present in a system can be quantified using an entanglement measure. In this talk I will present an overview of one such measure, the relative entanglement entropy, which originated in quantum information theory. This entanglement measure extends to quantum field theories, even in curved spacetimes, where it exhibits a surprisingly close relation to the spacetime geometry. Many details of this relation are still under active investigation.