Polarization-Correlated Photon Pairs from a Single Quantum Dot

Details Polarization-Correlated Photon Pairs from a Single Quantum Dot Polarization-Correlated Photon Pairs from a Single Quantum Dot

2001-11-13

arxiv.org/abs/cond-mat/0111242v2

Phys. Rev. B 66, 045308 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, revised discussion

Scientific paper

10.1103/PhysRevB.66.045308

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.

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