An Entangled Two Photon Source using Biexciton Emission of an Asymmetric Quantum Dot in a Cavity

Stace, T. M., Milburn, Gerard J. and Barnes, C. H. W. (2002) An Entangled Two Photon Source using Biexciton Emission of an Asymmetric Quantum Dot in a Cavity.

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Title An Entangled Two Photon Source using Biexciton Emission of an Asymmetric Quantum Dot in a Cavity
Abstract/Summary 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 polarisation entanglement, but experimentally-realised asymmetric dots produce photons entangled in both polarisation 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 polarisation-entangled photons. We consider a biexciton with non-degenerate intermediate excitonic states in a leaky optical cavity with pairs of degenerate cavity modes close to the non-degenerate exciton transition frequencies. An open quantum system approach is used to compute the polarisation 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 Bell-inequality violation, deriving a threshold at which Bell-inequality violations will be observed. Our results show that an ideal cavity will produce maximally polarisation-entangled photon pairs, and even a non-ideal cavity will produce partially entangled photon pairs capable of violating a Bell-inequality.
Keyword Quantum computing
Quantum dots
Quantum entanglement
Date 2002-11-01
Subjects 240200 Theoretical and Condensed Matter Physics
Author Stace, T. M.
Milburn, Gerard J.
Barnes, C. H. W.

Document type: Preprint
Collection: Centre for Marine Studies Publications
 
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Created: Wed, 04 Feb 2004, 10:00:00 EST by Belinda Weaver (EA)