Phonon-assisted decoherence in the production of polarization-entangled photons in a single semiconductor quantum dot

Details Phonon-assisted decoherence in the production of polarization-entangled photons in a single semiconductor quantum dot Phonon-assisted decoherence in the production of polarization-entangled photons in a single semiconductor quantum dot

2007-06-28

arxiv.org/abs/0706.4155v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figure, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.99.047402

We theoretically investigate the production of polarization-entangled photons through the biexciton cascade decay in a single semiconductor quantum dot. In the intermediate state the entanglement is encoded in the polarizations of the first emitted photon and the exciton, where the exciton state can be effectively ``measured'' by the solid state environment through the formation of a lattice distortion. We show that the resulting loss of entanglement becomes drastically enhanced if the phonons contributing to the lattice distortion are subject to elastic scatterings at the device boundaries, which might constitute a serious limitation for quantum-dot based entangled-photon devices.

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