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

Abstract

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.

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

References in corpus (5)

• Entangled Photon Pairs from Semiconductor Quantum Dots
• Size-dependent fine-structure splitting in self-organized InAs/GaAs quantum dots
• Manipulating exciton fine-structure in quantum dots with a lateral electric field
• Quantum-tomography of entangled photon pairs by quantum-dot cascade decay
• Quantum control of polaron states in semiconductor quantum dots

Cited by in corpus (5)

• Coherence of an Entangled Exciton-Photon State
• Entangled photon pairs produced by a quantum dot strongly coupled to a microcavity
• Optimizing H1 cavities for the generation of entangled photon pairs
• Entangled photon pairs from a quantum dot cascade decay: the effect of time-reordering
• Nonclassical Correlation of Polarization Entangled Photons in a Biexciton-Exciton Cascade