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. Quantum Information Processing Springer Journals

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

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Springer US
Copyright © 2015 by Springer Science+Business Media New York
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
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