Manipulating mesoscopic multipartite entanglement with atom-light interfaces

J. Stasińska, C. Rodó, S. Paganelli, G. Birkl, and A. Sanpera
Phys. Rev. A 80, 062304 – Published 2 December 2009

Abstract

Entanglement between two macroscopic atomic ensembles induced by measurement on an ancillary light system has proven to be a powerful method for engineering quantum memories and quantum state transfer. Here we investigate the feasibility of such methods for generation, manipulation, and detection of genuine multipartite entanglement (Greenberger-Horne-Zeilinger and clusterlike states) between mesoscopic atomic ensembles without the need of individual addressing of the samples. Our results extend in a nontrivial way the Einstein-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 second orthogonal light pulse interacting with the atomic samples, can modify and even reverse the entangling action of the first one leaving the samples in a separable state.

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  • Received 24 July 2009

DOI:https://doi.org/10.1103/PhysRevA.80.062304

©2009 American Physical Society

Authors & Affiliations

J. Stasińska1, C. Rodó1, S. Paganelli1, G. Birkl2, and A. Sanpera3,1

  • 1Grup de Física Teòrica, Universitat Autònoma de Barcelona and Ministerio de Educación, 08193 Bellaterra, Barcelona, Spain
  • 2Institut für Angewandte Physik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
  • 3Institució Catalana de Recerca i Estudis Avançats (ICREA), Lluís Companys 23, 08010 Barcelona, Spain

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Vol. 80, Iss. 6 — December 2009

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