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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…
Mesoscopic quantum superpositions in bimodal Bose-Einstein condensates: decoherence and strategies to counteract it
Krzysztof Pawlowski, Matteo Fadel, Philipp Treutlein +2
We study theoretically the interaction-induced generation of mesoscopic coherent spin state superpositions (small cat states) from an initial coherent spin state in bimodal Bose-Ei…
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…