Polarization-Correlated Photon Pairs from a Single Quantum Dot

Charles Santori, David Fattal, Matthew Pelton, Glenn S. Solomon, Yoshihisa Yamamoto

Published 2001-11-13, updated 2002-07-25Version 2

Polarization correlation in a linear basis, but not entanglement, is observed between the biexciton and single-exciton photons emitted by a single InAs quantum dot in a two-photon cascade. The results are well described quantitatively by a probabilistic model that includes two decay paths for a biexciton through a non-degenerate pair of one-exciton states, with the polarization of the emitted photons depending on the decay path. The results show that spin non-degeneracy due to quantum-dot asymmetry is a significant obstacle to the realization of an entangled-photon generation device.