Bell states generation on a III-V semiconductor chip at room temperature

Adeline Orieux (1) , Andreas Eckstein (1) , Aristide Lemaître (2) , Pascal Filloux (1) , Ivan Favero (1) , Giuseppe Leo (1) , Thomas Coudreau (1) , Arne Keller (3) , Pérola Milman (1) , Sara Ducci (1)

1 MPQ (UMR_7162) - Laboratoire Matériaux et Phénomènes Quantiques
2 LPN - Laboratoire de photonique et de nanostructures
3 ISMO - Institut des Sciences Moléculaires d'Orsay

We demonstrate the generation of polarization-entangled photon pairs at room temperature and telecom wavelength in a AlGaAs semiconductor waveguide. The source is based on spontaneous parametric down conversion with a counterpropagating phase-matching scheme. The quality of the two-photon state is assessed by the reconstruction of the density matrix giving a raw fidelity to a Bell state of 0.83; a theoretical model, taking into account the experimental parameters, provides ways to understand and control the amount of entanglement. Its compatibility with electrical injection, together with the high versatility of the generated two-photon state, make this source an attractive candidate for completely integrated quantum photonics devices.

Domaines: Physique Quantique [quant-ph]; Optique [physics.optics]

Adeline Orieux, Andreas Eckstein, Aristide Lemaître, Pascal Filloux, Ivan Favero, et al.. Bell states generation on a III-V semiconductor chip at room temperature. Physical Review Letters, 2013, pp.160502. ⟨10.1103/PhysRevLett.110.160502⟩. ⟨hal-00771207v2⟩