Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 3: Quantum Information: Concepts and Methods I

Q 3.5: Vortrag

Montag, 23. März 2015, 12:45–13:00, K/HS1

Non-locality in a Bose–Einstein condensate — •Roman Schmied¹, Jean-Daniel Bancal², Baptiste Allard¹, Matteo Fadel¹, Nicolas Sangouard¹, and Philipp Treutlein¹ — ¹Department of Physics, University of Basel, Switzerland — ²Centre for Quantum Technologies, National University of Singapore

By observing non-locality, it is possible to demonstrate that a system cannot be described by a local (classical) theory, even if the underlying local variables are hidden [1]. As a consequence, provably secure randomness can be extracted from any non-local system.

We present a robust experimental technique for detecting non-locality in a two-mode Bose–Einstein condensate. Among a family of Bell inequalities whose violation witnesses non-locality, we maximize the experimental signal-to-noise ratio in the presence of several types of noise. We report on the status of an experiment to detect non-locality in a BEC using this technique.

[1] N. Brunner et al., Rev. Mod. Phys. 86, 419 (2014).