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Evolution of Entanglement Between Distinguishable Light States

Research output: Contribution to journalJournal article


  • R. Mark Stevenson
  • Andrew J. Hudson
  • Anthony J. Bennett
  • Robert J. Young
  • Christine A. Nicoll
  • David A. Ritchie
  • Andrew J. Shields
Article number170501
Journal publication date24/10/2008
JournalPhysical Review Letters
Number of pages4
Original languageEnglish


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.