Cavity-enhanced two-photon interference using remote quantum dot sources

V. Giesz (1) , S. L. Portalupi (1) , T. Grange (2) , C. Anton (1) , L. de Santis (1) , J. Demory (1) , N. Somaschi (1) , I. Sagnes (1) , A. Lemaître (1) , L. Lanco (1) , Alexia Auffèves (2) , P. Senellart (1)

1 LPN - Laboratoire de photonique et de nanostructures
2 NEEL - NPSC - Nanophysique et Semiconducteurs

Quantum dots in cavities have been shown to be very bright sources of indistinguishable single photons. Yet the quantum interference between two such bright quantum dot sources, a critical step for photon-based quantum computation, still needs to be investigated. Here, we report on such a measurement, taking advantage of a deterministic fabrication of the devices. We show that cavity quantum electrodynamics can efficiently improve the quantum interference between remote quantum dot sources: Poorly indistinguishable photons can still interfere with good contrast with high quality photons emitted by a source in the strong Purcell regime. Our measurements and calculations show that cavity quantum electrodynamics is a powerful tool for interconnecting several quantum dot devices.

Mots clés: Generation; Indistinguishability; Spin; Device; Single Photons; Entangled Photon Pairs

Domaines: Physique [physics]

V. Giesz, S. L. Portalupi, T. Grange, C. Anton, L. de Santis, et al.. Cavity-enhanced two-photon interference using remote quantum dot sources. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (16), pp.161302. ⟨10.1103/PhysRevB.92.161302⟩. ⟨hal-01593302⟩