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Entanglement of spin waves among four quantum memories

Choi, K. S. and Goban, A. and Papp, S. B. and van Enk, S. J. and Kimble, H. J. (2010) Entanglement of spin waves among four quantum memories. Nature, 468 (7322). pp. 412-416. ISSN 0028-0836.

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Quantum networks are composed of quantum nodes that interact coherently through quantum channels, and open a broad frontier of scientific opportunities. For example, a quantum network can serve as a ‘web’ for connecting quantum processors for computation and communication, or as a ‘simulator’ allowing investigations of quantum critical phenomena arising from interactions among the nodes mediated by the channels. The physical realization of quantum networks generically requires dynamical systems capable of generating and storing entangled states among multiple quantum memories, and efficiently transferring stored entanglement into quantum channels for distribution across the network. Although such capabilities have been demonstrated for diverse bipartite systems, entangled states have not been achieved for interconnects capable of ‘mapping’ multipartite entanglement stored in quantum memories to quantum channels. Here we demonstrate measurement-induced entanglement stored in four atomic memories; user-controlled, coherent transfer of the atomic entanglement to four photonic channels; and characterization of the full quadripartite entanglement using quantum uncertainty relations. Our work therefore constitutes an advance in the distribution of multipartite entanglement across quantum networks. We also show that our entanglement verification method is suitable for studying the entanglement order of condensed-matter systems in thermal equilibrium.

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Additional Information:© 2010 Macmillan Publishers Limited. Received 4 July; accepted 5 October 2010. We acknowledge discussions with K. Hammerer, P. Zoller and J. Ye. This research is supported by the National Science Foundation, the DOD NSSEFF program, the Northrop Grumman Corporation and the Intelligence Advanced Research Projects Activity. A.G. acknowledges support by the Nakajima Foundation. S.B.P. acknowledges support received as a fellow of the Center for Physics of Information at Caltech. Author Contributions: All authors contributed extensively to the research presented in this paper.
Funding AgencyGrant Number
National Security Science and Engineering Faculty FellowshipUNSPECIFIED
Northrop Grumman CorporationUNSPECIFIED
Intelligence Advanced Research Projects Activity (IARPA)UNSPECIFIED
Nakajima FoundationUNSPECIFIED
Caltech Center for the Physics of InformationUNSPECIFIED
Subject Keywords:Physics; Applied physics; Engineering
Issue or Number:7322
Record Number:CaltechAUTHORS:20110103-103740097
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Official Citation:Choi, K. S., A. Goban, et al. (2010). "Entanglement of spin waves among four quantum memories." Nature 468(7322): 412-416.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21537
Deposited By: Tony Diaz
Deposited On:04 Jan 2011 18:32
Last Modified:26 Oct 2020 21:22

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