Bonn 2020 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 2: Classical Theory of General Relativity 1

GR 2.3: Talk

Monday, March 30, 2020, 12:15–12:30, H-HS IX

Relativistic Effects on Entanglement — •Roy Barzel and Claus Lämmerzahl — University of Bremen, ZARM, 28359 Bremen, Germany

Quantum Entanglement is not only one of the most intriguing and counter-intuitive phenomena in physics, but also plays a key role for future technologies such as Quantum Communication. Recently, in 2017 a new milestone in large scale entanglement distribution was achieved, when the entanglement between photons was verified over a distance more than 1200 kilometers.

In such a macroscopic setup, with increasingly larger distribution distances, general relativistic effects become more and more important. In this talk it is shown that particles undergo a Lorentz-Transformation and thereby a Wigner-Rotation when they travel through space-time. This can be represented as a unitary transformation, which acts on the particles quantum states, for instance electron-spin or photon-polarization. As a consequence Observers, who want to extract EPR-correlations via Bell Measurements from these particles, have to readjust their measurement basis to recover the full violation of Bell's Inequalities, which is the main result of the talk.