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Entanglement of a photon and a collective atomic excitation

Entanglement of a photon and a collective atomic excitation
Entanglement of a photon and a collective atomic excitation
We describe a new experimental approach to probabilistic atom-photon (signal) entanglement. Two qubit states are encoded as orthogonal collective spin excitations of an unpolarized atomic ensemble. After a programmable delay, the atomic excitation is converted into a photon (idler). Polarization states of both the signal and the idler are recorded and are found to be in violation of the Bell inequality. Atomic coherence times exceeding several microseconds are achieved by switching off all the trapping fields—including the quadrupole magnetic field of the magneto-optical trap—and zeroing out the residual ambient magnetic field
040405-[4pp]
Matsukevich, D.N.
178d5791-6289-4336-a788-e591ef406613
Chanelière, T.
72549647-85a3-4a35-ad20-8606b542553d
Bhattacharya, M.
f651561a-e4d4-45ba-875d-170349398119
Lan, S.-Y.
68fed702-d589-426b-b196-ca846b937f99
Jenkins, S.D.
65d861fb-b85a-4927-805a-7c906fca26c6
Kennedy, T.A.B.
68040c42-1663-4a03-87f0-b09045cf5357
Kuzmich, A.
7f959cd2-805c-4cb6-8938-8d6abcd212ee
Matsukevich, D.N.
178d5791-6289-4336-a788-e591ef406613
Chanelière, T.
72549647-85a3-4a35-ad20-8606b542553d
Bhattacharya, M.
f651561a-e4d4-45ba-875d-170349398119
Lan, S.-Y.
68fed702-d589-426b-b196-ca846b937f99
Jenkins, S.D.
65d861fb-b85a-4927-805a-7c906fca26c6
Kennedy, T.A.B.
68040c42-1663-4a03-87f0-b09045cf5357
Kuzmich, A.
7f959cd2-805c-4cb6-8938-8d6abcd212ee

Matsukevich, D.N., Chanelière, T., Bhattacharya, M., Lan, S.-Y., Jenkins, S.D., Kennedy, T.A.B. and Kuzmich, A. (2005) Entanglement of a photon and a collective atomic excitation. Physical Review Letters, 95 (4), 040405-[4pp]. (doi:10.1103/PhysRevLett.95.040405).

Record type: Article

Abstract

We describe a new experimental approach to probabilistic atom-photon (signal) entanglement. Two qubit states are encoded as orthogonal collective spin excitations of an unpolarized atomic ensemble. After a programmable delay, the atomic excitation is converted into a photon (idler). Polarization states of both the signal and the idler are recorded and are found to be in violation of the Bell inequality. Atomic coherence times exceeding several microseconds are achieved by switching off all the trapping fields—including the quadrupole magnetic field of the magneto-optical trap—and zeroing out the residual ambient magnetic field

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Published date: July 2005

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Local EPrints ID: 176281
URI: http://eprints.soton.ac.uk/id/eprint/176281
PURE UUID: 8220f5b7-33c3-4c33-af92-772b1f8a681c

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Date deposited: 07 Mar 2011 14:49
Last modified: 11 Apr 2022 17:58

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Contributors

Author: D.N. Matsukevich
Author: T. Chanelière
Author: M. Bhattacharya
Author: S.-Y. Lan
Author: S.D. Jenkins
Author: T.A.B. Kennedy
Author: A. Kuzmich

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