Interference of Single Photons from Two Separate Semiconductor Quantum Dots

Edward B. Flagg, Andreas Muller, Sergey V. Polyakov, Alex Ling, Alan Migdall, Glenn S. Solomon

Published 2010-04-01Version 1

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. Post-selection 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.