Regensburg 2002 – scientific programme

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HL: Halbleiterphysik

HL 15: Quantenpunkte und -dr
ähte: Optische Eigensch. I

HL 15.1: Talk

Tuesday, March 12, 2002, 11:00–11:15, H14

Biexcitons in Coupled Quantum Dots as a Source for Entangled Photons — •Oliver Gywat, Guido Burkard, and Daniel Loss — Departement für Physik und Astronomie, Universität Basel, Klingelbergstrasse 82, CH-4056 Basel, Schweiz

We study biexcitonic states in two tunnel-coupled semiconductor quantum dots and show that they provide a source for entangled photons which 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. We calculate the oscillator strengths for the biexciton recombination involving the sequential emission of two photons with entangled polarizations corresponding to the spin configuration in the biexciton states. We also show that the structure under study could provide a source for spin-entangled electrons.