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On-demand semiconductor source of 780 nm single photons with controlled temporal wave packets
Lucas Béguin, Jan-Philipp Jahn, Janik Wolters +8
We report on a fast, bandwidth-tunable single-photon source based on an epitaxial GaAs quantum dot. Exploiting spontaneous spin-flip Raman transitions, single photons at nm…
Spatial entanglement patterns and Einstein-Podolsky-Rosen steering in a Bose-Einstein condensate
Matteo Fadel, Tilman Zibold, Boris Décamps +1
Many-particle entanglement is a fundamental concept of quantum physics that still presents conceptual challenges. While spin-squeezed and other nonclassical states of atomic ensemb…
Light-Mediated Collective Atomic Motion in an Optical Lattice Coupled to a Membrane
Aline Vochezer, Tobias Kampschulte, Klemens Hammerer +1
We observe effects of collective atomic motion in a one-dimensional optical lattice coupled to an optomechanical system. In this hybrid atom-optomechanical system, the lattice ligh…
Simple atomic quantum memory suitable for semiconductor quantum dot single photons
Janik Wolters, Gianni Buser, Andrew Horsley +5
Quantum memories matched to single photon sources will form an important cornerstone of future quantum network technology. We demonstrate such a memory in warm Rb vapor with on-dem…
Optimal entanglement witnesses in a split spin-squeezed Bose-Einstein condensate
Enky Oudot, Jean-Daniel Bancal, Roman Schmied +2
How to detect quantum correlations in bi-partite scenarios using a split many-body system and collective measurements on each party? We address this question by deriving entangleme…
Bell correlations in a many-body system with finite statistics
Sebastian Wagner, Roman Schmied, Matteo Fadel +3
A recent experiment reported the first violation of a Bell correlation witness in a many-body system [Science 352, 441 (2016)]. Following discussions in this paper, we address here…