Biexcitons in Coupled Quantum Dots as a Source of Entangled Photons

Details Biexcitons in Coupled Quantum Dots as a Source of Entangled Photons Biexcitons in Coupled Quantum Dots as a Source of Entangled Photons

2001-09-12

arxiv.org/abs/cond-mat/0109223v2

Phys. Rev. B 65, 205329 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, v2: minor changes

Scientific paper

10.1103/PhysRevB.65.205329

We study biexcitonic states in two tunnel-coupled semiconductor quantum dots and show that such systems provide the possibility to produce polarization- entangled photons or spin-entangled electrons that are spatially separated at production. We distinguish between the various spin configurations and calculate the low-energy biexciton spectrum using the Heitler-London approximation as a function of magnetic and electric fields. The oscillator strengths for the biexciton recombination involving the sequential emission of two photons are calculated. The entanglement of the photon polarizations resulting from the spin configuration in the biexciton states is quantified as a function of the photon emission angles.

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