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Phys Rev Lett. 2006 Oct 27;97(17):173901. Epub 2006 Oct 23.

Semiconductor waveguide source of counterpropagating twin photons.

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Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162, Université Paris 7-Denis Diderot, Case 7021, 2 Place Jussieu, 75251 Paris, France.


We experimentally demonstrate an integrated semiconductor source of counterpropagating twin photons in the telecom range. A pump beam impinging on top of an AlGaAs waveguide generates parametrically two counterpropagating, orthogonally polarized signal/idler guided modes. A 2 mm long waveguide emits at room temperature one average photon pair per pump pulse, with a spectral linewidth of 0.15 nm. The twin character of the emitted photons is ascertained through a time-correlation measurement. This work opens a route towards new guided-wave semiconductor quantum devices.

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