Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 32: Atom & Ion Clocks and Metrology II
Q 32.6: Talk
Wednesday, March 12, 2025, 12:30–12:45, HS Botanik
Entanglement dynamics of photon pairs and quantum memories in the gravitational field of the earth — Roy Barzel1, Mustafa Gündoğan2, Markus Krutzik2, •Dennis Rätzel1, and Claus Lämmerzahl1 — 1ZARM, University of Bremen, Am Fallturm 2, 28359 Bremen, Germany — 2Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
We investigate the effect of entanglement dynamics due to gravity, the basis of a mechanism of universal decoherence, for photonic states and quantum memories in Mach-Zehnder and Hong-Ou-Mandel interferometry setups in the gravitational field of the earth. We show that chances are good to witness the effect with near-future technology in Hong-Ou-Mandel interferometry. This would represent an experimental test of theoretical modeling combining a multi-particle effect predicted by the quantum theory of light and an effect predicted by general relativity. Our article represents the first analysis of relativistic gravitational effects on space-based quantum memories which are expected to be an important ingredient for global quantum communication networks.
Keywords: entanglement; time dilation; red shift; quantum communication; general relativity