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Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics

Degree of entanglement of photon pairs generated from V‐type system in microcavity

Hiroshi Ajiki, Hajime Ishihara

Published Oct 20, 2008• 3 citations
Publisher

Abstract

Abstract We propose polarization‐entangled photon generation via resonant hyper‐parametric scattering of a V‐type system in microcavity. Although a bare V‐type system cannot generate entangled photon pairs, microcavity makes the generation possible because of the formation of dressed states. In the strong‐coupling limit, generation of non‐entangled co‐polarized photons is considerably suppressed due to the photon blockade effect. Furthermore, some entangled photons have different frequencies from those of the input fields, and thus, we can utilize spectral filtering in order to extract entangled photons. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

DOI
10.1002/pssc.200880306

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Theoretical study on entangled photon generation from a quantum dot (QD) embedded in microcavity is briefly reviewed within a strong coupling regime. In this system, entangled photon pairs can be generated through the cascade photon emission via dressed states in the cavity quantum electrodynamics (CQED). Excitation levels of a QD are modeled by a V-type three-level system and four-level system including a biexciton. In contrast to the entangled-photon generation until now, all four Bell states can be generated from an identical cavity system by simply selecting applied-field polarizations and frequencies as characteristic features of the CQED. The CQED effects play a crucial role in providing a high degree of entanglement: (i) spectral fi ltering can be used to extract entangled photons due to the vacuum Rabi splitting and (ii) non-entangled co-polarized photons are strongly suppressed due to the photon blockade effect.
Abstract We theoretically investigate entangled‐photon generation via biexciton in a planar microcavity. When the exciton‐photon coupling is comparable to the biexciton binding energy, the biexciton can be stably coupled with the cavity photons (referred to as a cavity biexciton). Entangled photons are generated by the cascade decay of the cavity biexciton. We show that high‐efficient generation of entangled photons can be achieved when the superposition state of a cavity biexciton and two cavity polaritons formed by unbound two‐exciton states is realized. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)