Semiconductor waveguide source of counterpropagating twin photons.
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.
Lanco
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Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162, Université Paris 7-Denis Diderot, Case 7021, 2 Place Jussieu, 75251 Paris, France.
Ducci
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Likforman
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Marcadet
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van Houwelingen
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Zbinden
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Leo
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Berger
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