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Coherence of an entangled exciton-photon state

Hudson, A. J. and Stevenson, R. M. and Bennett, A. J. and Young, R. J. and Nicoll, C. A. and Atkinson, P. and Cooper, K. and Ritchie, D. A. and Shields, A. J. (2007) Coherence of an entangled exciton-photon state. Physical Review Letters, 99 (26). -. ISSN 0031-9007

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Abstract

We study the effect of the exciton fine-structure splitting on the polarization entanglement of photon pairs produced by the biexciton cascade in a quantum dot. Entanglement persists despite separations between the intermediate energy levels of up to 4 mu eV. Measurements show that entanglement of the photon pair is robust to the dephasing of the intermediate exciton state responsible for the first-order coherence time of either single photon. We present a theoretical framework incorporating the effects of spin scattering, background light, and dephasing. We distinguish between the first-order coherence time, and a parameter which we measure for the first time and define as the cross-coherence time.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 54916
Deposited By: ep_importer_pure
Deposited On: 07 Jun 2012 11:45
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:36
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/54916

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