Manipulating mesoscopic multipartite entanglement with atom-light interfaces

TitleManipulating mesoscopic multipartite entanglement with atom-light interfaces
Publication TypeJournal Article
Year of Publication2009
AuthorsStasińska, J, Rodó, C, Paganelli, S, Sanpera, A, Birkl, G
JournalPhysical Review A (Atomic, Molecular, and Optical Physics)
Date Published12/2009
Keywordsatom-photon collisions, EPR paradox, measurement theory, mesoscopic entanglement, multipartite entanglement, quantum entanglement, quantum optics

Entanglementbetween two macroscopic atomic ensembles induced by measurement on anancillary light system has proven to be a powerful methodfor engineering quantum memories and quantum state transfer. Here weinvestigate the feasibility of such methods for generation, manipulation, anddetection of genuine multipartite entanglement (Greenberger-Horne-Zeilinger and clusterlike states) betweenmesoscopic atomic ensembles without the need of individual addressing ofthe samples. Our results extend in a nontrivial way theEinstein-Podolsky-Rosen entanglement between two macroscopic gas samples reported experimentally in[B. Julsgaard, A. Kozhekin, and E. Polzik, Nature (London) 413,400 (2001)]. We find that under realistic conditions, a secondorthogonal light pulse interacting with the atomic samples, can modifyand even reverse the entangling action of the first oneleaving the samples in a separable state. ©2009 The American Physical Society

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