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Coherence of an entangled exciton-photon state

Hudson, A. J., Stevenson, R. M., Bennett, Anthony, Young, R. J., Nicoll, C. A., Atkinson, P., Cooper, K., Ritchie, D. A. and Shields, A. J. 2007. Coherence of an entangled exciton-photon state. Physical Review Letters 99 (26) , 266802. 10.1103/PhysRevLett.99.266802

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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  μeV. 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
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: American Physical Society
ISSN: 0031-9007
Last Modified: 27 Nov 2017 16:38

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