Evolution of entanglement between distinguishable light states |
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Authors: | Stevenson R Mark Hudson Andrew J Bennett Anthony J Young Robert J Nicoll Christine A Ritchie David A Shields Andrew J |
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Institution: | Toshiba Research Europe Limited, 208 Cambridge Science Park, Cambridge, United Kingdom. |
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Abstract: | 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. |
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