Evolution of entanglement between distinguishable light states

We investigate the evolution of quantum correlations over the lifetime of a multiphoton state. Measurements reveal time-dependent oscillations of the entanglement fidelity for photon pairs created by a single semiconductor quantum dot. The oscillations are attributed to the phase acquired in the int...

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Bibliographic Details
Published in:Physical review letters 2008-10, Vol.101 (17), p.170501-170501, Article 170501
Main Authors: Stevenson, R Mark, Hudson, Andrew J, Bennett, Anthony J, Young, Robert J, Nicoll, Christine A, Ritchie, David A, Shields, Andrew J
Format: Article
Language:English
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Summary:We investigate the evolution of quantum correlations over the lifetime of a multiphoton state. Measurements reveal time-dependent oscillations of the entanglement fidelity for photon pairs created by a single semiconductor quantum dot. The oscillations are attributed to the phase acquired in the intermediate, nondegenerate, exciton-photon state and are consistent with simulations. We conclude that emission of photon pairs by a typical quantum dot with finite polarization splitting is in fact entangled in a time-evolving state, and not classically correlated as previously regarded.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.101.170501