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New Journal of Physics

Cavity-assisted generation of entangled photons from a V-type three-level system

Hiroshi Ajiki, Hajime Ishihara, Keiichi Edamatsu

Published Mar 26, 2009• 15 citations
Publisher

Abstract

We propose a new type of entangled-photon generation from a V-type system in a microcavity. In contrast to the entangled-photon generation until now, all four Bell states can be freely generated from an identical cavity system by simply selecting applied-field polarizations and frequencies due to the excitation of dressed states in cavity quantum electrodynamics (CQED). CQED effects play a crucial role in providing a high degree of entanglement: (i) spectral filtering 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. The proposed system efficiently generates a high degree of entangled photons by moderately increasing the applied-field intensity.

DOI
10.1088/1367-2630/11/3/033033

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We propose a new type of entangled-photon generation from a V-type system in a microcavity. In contrast to the entangled-photon generation until now, all four Bell states can be freely generated from an identical cavity system by simply selecting applied-field polarizations and frequencies due to the excitation of dressed states in cavity quantum electrodynamics (CQED). CQED effects play a crucial role in providing a high degree of entanglement: (i) spectral filtering 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. The proposed system efficiently generates a high degree of entangled photons by moderately increasing the applied-field intensity.
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 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)
We theoretically investigate polarization-entangled-photon generation by using a quantum dot embedded in a microcavity. In the absence of a biexciton, two of the four Bell states can be generated by applying cross-circularly polarized laser fields because of a cavity quantum electrodynamics effect [Ajiki et al., New J. Phys. 11, 033033 (2009)]. In the presence of the biexciton state, the generation of these Bell states can be forbidden under specific conditions. Furthermore, another type of Bell state can be generated by applying cross-circularly polarized fields. Our results indicate that one can generate three different types of Bell-state photon pairs just by changing the frequencies of the applied fields.
Abstract We theoretically study polarization‐entangled photon generation from a single quantum dot in a microcavity. Entangled‐photon pairs with singlet or triplet Bell states are generated in the resonant‐hyperparametric scattering via dressed states in the cavity QED. Although co‐polarized non‐entangled photons are also generated, the generation is dramatically suppressed in the strong‐coupling limit owing to the photon blockade effect. Finite binding energy of biexciton is also important for the generation of photon pairs with high degree of entanglement. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
In this paper, we provide theoretical study on entangled photon generation by means of RHPS in a QD embedded in a microcavity. The emphasis lies on the photon blockade effect on efficient entangled photon generation with high degree of purity. Furthermore, we note that a biexciton plays only a minor role in entangled photon generation because of the characteristic excited states in the cavity QED. This is contrast to entangled photon generation in a semiconductor until now, in which excitation of biexciton is indispensable for the entangled photon generation.