In-plane emission of indistinguishable photons generated by an integrated quantum emitter

TL;DR

This paper demonstrates on-chip emission of indistinguishable photons from an integrated quantum dot in a photonic crystal, enabling advances in photonic quantum circuits through on-chip two-photon interference.

Contribution

It introduces an integrated quantum emitter in a photonic crystal that produces indistinguishable photons suitable for on-chip quantum photonics.

Findings

Successful demonstration of on-chip two-photon interference.

Photon indistinguishability verified via Hong-Ou-Mandel experiment.

Potential for integrated quantum photonic circuits.

Abstract

We demonstrate the emission of indistinguishable photons along a semiconductor chip originating from carrier recombination in an InAs quantum dot. The emitter is integrated in the waveguiding region of a photonic crystal structure, allowing for on-chip light propagation. We perform a Hong-Ou-Mandel-type of experiment with photons collected from the exit of the waveguide and we observe two-photon interference under continuous wave excitation. Our results pave the way for the integration of quantum emitters in advanced photonic quantum circuits.