Physics – Quantum Physics
Scientific paper
2008-03-27
Physics
Quantum Physics
Scientific paper
10.1103/PhysRevLett.101.170501
We investigate the evolution of quantum correlations over the lifetime of a multi-photon 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, non-degenerate, exciton-photon state and are consistent with simulations. We conclude that emission of photon pairs by a typical quantum dot with finite polarisation splitting is in fact entangled in a time-evolving state, and not classically correlated as previously regarded.
Bennett Anthony. J.
Hudson Andrew J.
Nicoll Christine A.
Ritchie David A.
Shields Andrew J.
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