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Time-evolving entanglement and violation of bell inequalities using a quantum dot photon-pair emitter

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  • R. M. Stevenson
  • R. J. Young
  • A. J. Hudson
  • A. J. Bennett
  • C. A. Nicoll
  • D. A. Ritchie
  • A. J. Shields


Polarization-entangled photons provide intriguing insight into the fundamentals of quantum physics, and are vital technology for large scale quantum computing with linear optics, and extending the distance over which a quantum key can be shared. However, those entangled photon sources that have been implemented so far are typically probed using time-averaged measurements, thus obscuring any quantum correlations that evolve over the lifetime of the state. Here we measure the evolution of quantum correlations over the lifetime of a photon pair state, generated by an optically excited quantum dot at ~10K. Time-dependent oscillations of the entanglement fidelity are observed, and attributed to the spin-dependent phase acquired in the intermediate, non-degenerate, exciton-photon state.