Maximal atom–photon entanglement in a double- $$\Lambda $$ Λ quantum system

Maximal atom–photon entanglement in a double- $$\Lambda $$ Λ quantum system The atom–photon entanglement of a dressed atom and its spontaneous emission in a double- $$\Lambda $$ Λ closed-loop atomic system is studied under multi-photon resonance condition. It is shown that even in the absence of quantum interference due to the spontaneous emission, the von Neumann entropy is phase-sensitive and it can be controlled by either intensity or relative phase of the applied fields. It is demonstrated that for the special case of Rabi frequency of the applied fields, the system is maximally entangled. Moreover, an open-loop configuration is considered, and it is shown that the degree of entanglement can be controlled by intensity of the applied fields. Furthermore, in electromagnetically induced transparency condition, the system is disentangled. Such a system can be used for quantum information processing via entanglement using optical switching. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

Maximal atom–photon entanglement in a double- $$\Lambda $$ Λ quantum system

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Publisher
Springer Journals
Copyright
Copyright © 2015 by Springer Science+Business Media New York
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-015-0969-1
Publisher site
See Article on Publisher Site

Abstract

The atom–photon entanglement of a dressed atom and its spontaneous emission in a double- $$\Lambda $$ Λ closed-loop atomic system is studied under multi-photon resonance condition. It is shown that even in the absence of quantum interference due to the spontaneous emission, the von Neumann entropy is phase-sensitive and it can be controlled by either intensity or relative phase of the applied fields. It is demonstrated that for the special case of Rabi frequency of the applied fields, the system is maximally entangled. Moreover, an open-loop configuration is considered, and it is shown that the degree of entanglement can be controlled by intensity of the applied fields. Furthermore, in electromagnetically induced transparency condition, the system is disentangled. Such a system can be used for quantum information processing via entanglement using optical switching.

Journal

Quantum Information ProcessingSpringer Journals

Published: Mar 14, 2015

References

  • Can quantum-mechanical description of physical reality be considered complete?
    Einstein, A; Podolsky, B; Rosen, N
  • Quantifying entanglement
    Vedral, V; Plenio, MB; Rippin, MA; Knight, PL
  • Entangled images from four-wave mixing
    Boyer, V; Marino, AM; Pooser, RC; Lett, PD

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