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Entangling distant atoms by interference of polarized photons. | LitMetric

Entangling distant atoms by interference of polarized photons.

Phys Rev Lett

Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China.

Published: May 2003

AI Article Synopsis

  • The proposed scheme generates entangled states of two Lambda-type three-level atoms in separate cavities using the interference of polarized photons.
  • Spontaneous emissions from the excited atoms create a coherent superposition, leading to entangled states despite the atoms being distinguishable in their ground states.
  • Unlike previous methods requiring a weakly driven condition, this new approach mitigates the negative effects of atomic excitement and recoil, improving the fidelity of entanglement.

Article Abstract

We propose a scheme to generate the entangled state of two Lambda-type three-level atoms trapped in distant cavities by using interference of polarized photons. Two possible spontaneous emission channels of each excited atom result in a coherent superposition of the states of two atoms. The subsequent detection of the different polarized photons reveals that both atoms are in different ground states, but an interference effect prevents us from distinguishing which atom is in which ground state; the atoms are thus entangled. In comparison with the original proposal of interference-induced entanglement [C. Cabrillo, J. Cirac, P. Garcia-Fernandez, and P. Zoller, Phys. Rev. A 59, 1025 (1999)]], in our scheme the weakly driven condition is not required, and the influence of atomic excitement and atomic recoil on the entanglement fidelity can be eliminated.

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Source
http://dx.doi.org/10.1103/PhysRevLett.90.217902DOI Listing

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