Semiconductor ridge microcavity source of quantum light at room temperature

TL;DR

This paper reports the experimental realization of a semiconductor ridge microcavity that generates entangled photon pairs at room temperature in the telecom range, using parametric down conversion with high indistinguishability.

Contribution

It introduces a novel integrated semiconductor microcavity source of quantum light operating at room temperature with high photon indistinguishability.

Findings

Photon pair generation efficiency of 10^(-11)

Spectral linewidth of 0.3 nm

Photon indistinguishability with 85% visibility

Abstract

We experimentally demonstrate an integrated semiconductor ridge microcavity source of counterpropagating twin photons at room temperature in the telecom range. Based on parametric down conversion with a counterpropagating phase-matching, pump photons generate photon pairs with an efficiency of about 10^(-11) and a spectral linewidth of 0.3 nm for a 1mm long sample. The indistiguishability of the photons of the pair are measured via a two-photon interference experiment showing a visibility of 85%. This work opens a route towards new guided-wave semiconductor quantum devices.