Entangled two-photon source using biexciton emission of an asymmetric quantum dot in a cavity

Stace, T. M., Milburn, G. J. and Barnes, C. H. W. (2003) Entangled two-photon source using biexciton emission of an asymmetric quantum dot in a cavity. Physical Review B, 67 8: 085317.1-085317.15. doi:10.1103/PhysRevB.67.085317

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Author Stace, T. M.
Milburn, G. J.
Barnes, C. H. W.
Title Entangled two-photon source using biexciton emission of an asymmetric quantum dot in a cavity
Journal name Physical Review B   Check publisher's open access policy
ISSN 1098-0121
Publication date 2003-02
Sub-type Article (original research)
DOI 10.1103/PhysRevB.67.085317
Open Access Status File (Publisher version)
Volume 67
Issue 8
Start page 085317.1
End page 085317.15
Total pages 15
Place of publication New York
Publisher The American Physical Society
Collection year 2003
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
Abstract A semiconductor based scheme has been proposed for generating entangled photon pairs from the radiative decay of an electrically pumped biexciton in a quantum dot. Symmetric dots produce polarization entanglement, but experimentally realized asymmetric dots produce photons entangled in both polarization and frequency. In this work, we investigate the possibility of erasing the “which-path” information contained in the frequencies of the photons produced by asymmetric quantum dots to recover polarization-entangled photons. We consider a biexciton with nondegenerate intermediate excitonic states in a leaky optical cavity with pairs of degenerate cavity modes close to the nondegenerate exciton transition frequencies. An open quantum system approach is used to compute the polarization entanglement of the two-photon state after it escapes from the cavity, measured by the visibility of two-photon interference fringes. We explicitly relate the two-photon visibility to the degree of the Bell-inequality violation, deriving a threshold at which Bell-inequality violations will be observed. Our results show that an ideal cavity will produce maximally polarization-entangled photon pairs, and even a nonideal cavity will produce partially entangled photon pairs capable of violating a Bell-inequality.
Keyword Physics, Condensed Matter
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 02:28:14 EST