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Quantum Information Processing

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

Zeinab Kordi, Saeed Ghanbari, Mohammad Mahmoudi

Published Mar 13, 2015• 7 citations
Publisher
DOI
10.1007/s11128-015-0969-1

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The atom-photon entanglement of dressed atom and its spontaneous emission in a Double-Lambda closed-loop atomic system is studied in 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, the open-loop configuration is considered and it is shown that the degree of entanglement measure (DEM) 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.
The entanglement of Λ-type three-level atoms and thermal photons in a nanocavity inside a double-band photonic crystal is studied. The partially transposed density matrix and, consequently, the negativity, as a measure of entanglement, are determined at a temperature T . By analyzing the eigenvalues of the partially transposed density matrix, we show that the thermal atom–field states remain coherent for all temperatures. Furthermore, plots of the negativity indicate that at a definite temperature, which strongly depends upon the location of the photonic band gaps, the entanglement is maximal. How the location of the photonic band gaps, relative to the atomic transition frequencies, affects this temperature is also addressed.