Journal
PHYSICAL REVIEW LETTERS
Volume 112, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.243602
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Funding
- NSFC [11104085, 11125417, 61378012]
- Major Research Plan of the NSFC [91121023]
- SKPBR of China [2011CB922104, 2011CBA00200]
- FOYTHEG [Yq2013050]
- PRNPGZ [2014010]
- PCSIRT [IRT1243]
- Hong Kong Research Grants Council [HKU8/CRF/11G]
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We demonstrate an efficient experimental scheme for producing polarization-entangled photon pairs from spontaneous four-wave mixing (SFWM) in a laser-cooled 85Rb atomic ensemble, with a bandwidth (as low as 0.8 MHz) much narrower than the rubidium atomic natural linewidth. By stabilizing the relative phase between the two SFWM paths in a Mach-Zehnder interferometer configuration, we are able to produce all four Bell states. These subnatural-linewidth photon pairs with polarization entanglement are ideal quantum information carriers for connecting remote atomic quantum nodes via efficient light-matter interaction in a photon-atom quantum network.
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