Independent indistinguishable quantum light sources on a reconfigurable photonic integrated circuit

TL;DR

This paper demonstrates a scalable quantum photonic circuit integrating multiple independent quantum light sources that can be individually tuned and produce indistinguishable photons, enabling advanced quantum information processing.

Contribution

It introduces a compact, reconfigurable photonic circuit combining independent quantum light sources with on-chip interference capabilities.

Findings

Independent tuning of quantum emitters via Stark Effect

Successful on-chip Hong-Ou-Mandel interference

Scalable integration of multiple quantum light sources

Abstract

We report a compact, scalable, quantum photonic integrated circuit realised by combining multiple, independent InGaAs/GaAs quantum-light-emitting-diodes (QLEDs) with a silicon oxynitride waveguide circuit. Each waveguide joining the circuit can then be excited by a separate, independently electrically contacted QLED. We show that the emission from neighbouring QLEDs can be independently tuned to degeneracy using the Stark Effect and that the resulting photon streams are indistinguishable. This enables on-chip Hong-Ou-Mandel-type interference, as required for many photonic quantum information processing schemes.