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Phys Rev Lett. 2010 Apr 2;104(13):137401. Epub 2010 Apr 1.

Interference of single photons from two separate semiconductor quantum dots.

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  • 1Joint Quantum Institute, National Institute of Standards and Technology & University of Maryland, Gaithersburg, Maryland, USA.


We demonstrate and characterize interference between discrete photons emitted by two separate semiconductor quantum dot states in different samples excited by a pulsed laser. Their energies are tuned into resonance using strain. The photons have a total coalescence probability of 18.1% and the coincidence rate is below the classical limit. Postselection of coincidences within a narrow time window increases the coalescence probability to 47%. The probabilities are reduced from unity because of dephasing and the postselection value is also reduced by the detector time response.

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