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HL: Fachverband Halbleiterphysik

HL 74: Focus Session: Semiconductor-based Quantum Communication I

HL 74.4: Invited Talk

Thursday, March 29, 2012, 11:30–12:00, ER 164

Semiconductor photonics for quantum information applications — •Andrew Shields — Toshiba Research Europe, 208 Cambridge Science Park, Milton Road, Cambridge UK

We discuss recent progress in generating and detecting quantum states of light using semiconductor devices. Single photon light emitting diodes (LEDs) generate quantum light states via the electroluminescence of a single self-assembled quantum dot. Recently the viability of these sources for quantum information applications has been greatly enhanced by voltage-controlled wavelength tuning that allows indistinguishable photons to be generated from different, spatially-separated devices. Quantum dot LEDs may also be used to generate polarization-entangled photon pairs. Semiconductor detection technology has also advanced remarkably in recent years, now allowing high efficiency detection with photon number resolution. We discuss the application of these devices to photonic quantum logic and long distance quantum communication.