Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.170501
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Funding
- EU through FP6 network of excellence Sandie
- FP6 integrated projects QAP and SECOQC
- U.K. through the QIP IRC
- EPSRC
- EPSRC [EP/E058019/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E058019/1] Funding Source: researchfish
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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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