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mercredi 26 février


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Accueil > Actualités > Entangled photons in a III-V chip

Entangled photons in a III-V chip

Photonics is to play a central role in the development of quantum information and communication technologies. Integrability, room temperature operation and compatibility with the telecom network constitute some key issues for future quantum components. A. Orieux and colleagues at ‘Matériaux et Phénomènes Quantiques’ Laboratory (Paris Diderot University and CNRS) report in Physical Review Letters the first III-V semiconductor source of entangled photons working at room temperature and telecom wavelength.

Sketch of the experimental setup to generate Bell states
Sketch of the experimental setup to generate Bell states

The device is an AlGaAs microcavity waveguide in which a transverse pump beam generates polarization-entangled photon pairs by parametric down conversion. The state of the system is characterized through a complete quantum tomography that demonstrates fidelity of 83% to a maximally entangled state and a consequent violation of Bell’s inequality. The approach employed by the authors avoids post-manipulation of the generated photons and is thus particularly suitable for large-scale quantum photonic architectures. A theoretical model taking into account the experimental details provides ways to understand and control the amount of entanglement.

The compatibility of the device with electrical injection, together with the high versatility of the generated two-photon states, makes the reported source a promising candidate for fully integrated quantum photonics.

Voir en ligne : Report in Physical Review Letters