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Measurement-induced entanglement for excitation stored in remote atomic ensembles

Chou, C. W. and de Riedmatten, H. and Felinto, D. and Polyakov, S. V. and van Enk, S. J. and Kimble, H. J. (2005) Measurement-induced entanglement for excitation stored in remote atomic ensembles. Nature, 438 (7069). pp. 828-832. ISSN 0028-0836. doi:10.1038/nature04353.

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A critical requirement for diverse applications in quantum information science is the capability to disseminate quantum resources over complex quantum networks. For example, the coherent distribution of entangled quantum states together with quantum memory (for storing the states) can enable scalable architectures for quantum computation, communication and metrology. Here we report observations of entanglement between two atomic ensembles located in distinct, spatially separated set-ups. Quantum interference in the detection of a photon emitted by one of the samples projects the otherwise independent ensembles into an entangled state with one joint excitation stored remotely in 10^5 atoms at each site. After a programmable delay, we confirm entanglement by mapping the state of the atoms to optical fields and measuring mutual coherences and photon statistics for these fields. We thereby determine a quantitative lower bound for the entanglement of the joint state of the ensembles. Our observations represent significant progress in the ability to distribute and store entangled quantum states.

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Additional Information:© 2005 Nature Publishing Group. Received 31 August; accepted 19 October 2005. We gratefully acknowledge J. Hall and J. Ye for discussions about phase stabilization. This research is supported by the Advanced Research and Development Activity (ARDA), by the National Science Foundation, and by the Caltech MURI Center for Quantum Networks. D.F. acknowledges financial support by CNPq (Brazilian agency). H.d.R. acknowledges financial support by the Swiss National Science Foundation. S.J.v.E. thanks L. Huelsbergen for assistance in computer matters.
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Advanced Research and Development Activity (ARDA)UNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Swiss National Science Foundation (SNSF)UNSPECIFIED
Issue or Number:7069
Record Number:CaltechAUTHORS:20150325-092056744
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Official Citation:Chou, C. W., de Riedmatten, H., Felinto, D., Polyakov, S. V., van Enk, S. J., & Kimble, H. J. (2005). Measurement-induced entanglement for excitation stored in remote atomic ensembles. [10.1038/nature04353]. Nature, 438(7069), 828-832.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56058
Deposited By: Jason Perez
Deposited On:26 Mar 2015 03:49
Last Modified:10 Nov 2021 20:53

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