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Conference on Lasers and Electro-Optics

Entangled-photon generation via biexcitons in semiconductor nano-structures

Motoaki Bamba, Hajime Ishihara

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We construct full quantum theory for optical response of weakly confined excitonic systems with considering exciton dispersion and dielectric structures. It is revealed that confined exciton-polariton makes remarkable influences to entangled-photon generation.
DOI
10.1109/cleo.2006.4628630

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Abstract We have constructed quantum electrodynamics theory for excitons whose center‐of‐mass motion is confined in arbitrary‐structured dielectrics with considering their nonlocal optical susceptibility. We systematically investigate entangled‐photon generation via biexcitons in nano‐to‐macro scale materials by this theory. It is revealed that nano‐structured materials provide scattering spectra explicitly reflecting quantum states of confined exciton‐polaritons and are promising sources of entangled photons from the viewpoints of both efficiency and signal‐to‐noise ratio. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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We present a fully quantum mechanical theory for an interacting system of photonsand Coulomb correlated electrons and holes in a semiconductor, using a pertubation series in theexciting laser field. The theory provides microscopic descriptions of nonlinear optical processes insemiconductors related to the electromagnetic field quantization. As an application of the theorywe show that it is possible to transfer the exciton exciton Coulomb correlation to photons, thusproducing pairs of near-gap photons with a high degree of quantum entanglement. The photon pairsemerge from the spontaneous optical decay of biexcitons into two polaritons. The pair intensitycorrelations, calculated in the lowdensity limit for a CuCl slab and for semiconductor microcavities,exhibit quantum features which can be observed by coincidence detection.