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Entangled photons on-demand from a single quantum dot

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A source of triggered entangled photon pairs is a vital commodity for quantum information applications based on quantum optics. The most commonly used source of entangled photon pairs currently, parametric down conversion, produces a probabilistic numbers of photons pairs per excitation cycle making them of limited use, especially in quantum information schemes. We demonstrate on-demand emission of polarisation-entangled photon pairs from the biexciton cascade of a single InAs quantum dot embedded in a GaAs/AlAs planar cavity, the first semiconductor source of triggered entangled photon emission. Results presented show that ~70% of the photon pairs measured are entangled in the expected |HH>+|VV> basis.

This talk is part of the Semiconductor Physics series.

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