Coherence of an entangled exciton-photon state

Hudson, A. J., Stevenson, R. M., Bennett, Anthony ORCID: https://orcid.org/0000-0002-5386-3710, 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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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  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:	03 Nov 2022 10:04
URI:	https://orca.cardiff.ac.uk/id/eprint/106820

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