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

Entangled‐photon generation via biexcitons in nano‐structures

Motoaki Bamba, Hajime Ishihara

Published Oct 30, 2006• 6 citations
Publisher

Abstract

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)

DOI
10.1002/pssc.200672106

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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)
We have constructed a theoretical framework of the biexciton-resonant hyperparametric scattering for the pursuit of high-power and high-quality generation of entangled photon pairs. Our framework is applicable to nano-to-bulk crossover regime where the center-of-mass motion of excitons and biexcitons is confined. We can also consider material surroundings and the polarization correlation of generated photons. Analyzing the thickness dependence of the entangled-photon generation, we have revealed that the crossover regime generally show a high performance from the viewpoint of statistical accuracy, and the generation efficiency can beenhanced by an optical cavity with maintaining the high performance. The crossover regime has a variety of degrees of freedom to tune the entangled-photon generation, and the scattering spectra explicitly reflect quantized excitonphoton coupled modes in the finite structure.
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)
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)
Abstract We theoretically investigate the production of polarization‐entangled photons through the biexciton cascade decay in a single semiconductor quantum dot. A biexciton radiatively decays through two intermediate exciton states, where polarization‐entangled photons are emitted if the two decay paths differ in polarization but are indistinguishable otherwise. This ideal performance is usually spoiled by the electron–hole exchange interaction splitting the intermediate exciton states by a small amount and consequently attaching a which‐path information to the photon frequencies. We discuss post‐selection schemes to mask this which‐path information to an outside observer. We show how spectral filtering and time shifts at a single photon level affect the photon state. Here the solid state environment plays a crucial role in the effective measurement of intermediate exciton states. Evaluating our analytical results with realistic quantum dot parameters we quantify the applicability of suggested protocols for solid‐state based quantum cryptography. Our results indicate, that a high degree of entanglement is only reached by spectral alignment of the exciton states. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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