Biexcitons in coupled quantum dots as a source of entangled photons

Oliver Gywat, Guido Burkard, and Daniel Loss
Phys. Rev. B 65, 205329 – Published 22 May 2002
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Abstract

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.

  • Received 5 February 2002

DOI:https://doi.org/10.1103/PhysRevB.65.205329

©2002 American Physical Society

Authors & Affiliations

Oliver Gywat, Guido Burkard, and Daniel Loss

  • Department of Physics and Astronomy, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

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Issue

Vol. 65, Iss. 20 — 15 May 2002

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