Ultrabright source of entangled photon pairs

Adrien Dousse, Jan Suffczyński, Alexios Beveratos, Olivier Krebs, Aristide Lemaître, Isabelle Sagnes, Jacqueline Bloch, Paul Voisin and Pascale Senellart ()
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Adrien Dousse: Laboratoire de Photonique et de Nanostructures, CNRS
Jan Suffczyński: Laboratoire de Photonique et de Nanostructures, CNRS
Alexios Beveratos: Laboratoire de Photonique et de Nanostructures, CNRS
Olivier Krebs: Laboratoire de Photonique et de Nanostructures, CNRS
Aristide Lemaître: Laboratoire de Photonique et de Nanostructures, CNRS
Isabelle Sagnes: Laboratoire de Photonique et de Nanostructures, CNRS
Jacqueline Bloch: Laboratoire de Photonique et de Nanostructures, CNRS
Paul Voisin: Laboratoire de Photonique et de Nanostructures, CNRS
Pascale Senellart: Laboratoire de Photonique et de Nanostructures, CNRS

Nature, 2010, vol. 466, issue 7303, 217-220

Abstract: Sourcing entangled photon pairs Entangled photon pairs are essential components for practical quantum information applications. Two different approaches for producing entanglement are available: parametric conversion in a nonlinear optical medium, or radiative decay of electron–hole pairs trapped in a semiconductor quantum dot. The first approach has a low intrinsic efficiency; the second suffers from poor collection efficiency. In general, collection of emitted photons from quantum dots is often improved by coupling them to an optical cavity, but this is not straightforward to implement for entangled photon pairs. Dousse et al. have now constructed a suitable optical cavity in the form of a 'photonic molecule' — two connecting identical microcavities that are deterministically coupled to the optically active modes of a pre-selected quantum dot. They show that entangled photon pairs are emitted into two cavity modes, with a rate of 0.12 per excitation pulse. The authors believe that improvements in the fabrication of the device should enable triggered sources of entangled photon pairs, with an overall (creation and collection) efficiency of 80%.

Date: 2010
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DOI: 10.1038/nature09148

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