An integrated source of spectrally filtered correlated photons for large scale quantum photonic systems

TL;DR

This paper presents a CMOS-fabricated integrated system generating spectrally filtered, quantum-correlated photon pairs with high purity and routing capabilities, advancing large-scale quantum photonic circuits.

Contribution

It introduces a scalable, integrated source of correlated photons with spectral filtering and routing, suitable for large quantum photonic systems.

Findings

Spectral filtering of pump field exceeds 95dB using Bragg reflectors and tunable resonators.

Achieved non-classical two-photon correlations with a ratio of 50.

Demonstrated on-chip routing of signal and idler photons after fiber transfer.

Abstract

We demonstrate the generation of quantum-correlated photon-pairs combined with the spectral filtering of the pump field by more than 95dB using Bragg reflectors and electrically tunable ring resonators. Moreover, we perform demultiplexing and routing of signal and idler photons after transferring them via a fiber to a second identical chip. Non-classical two-photon temporal correlations with a coincidence-to-accidental ratio of 50 are measured without further off-chip filtering. Our system, fabricated with high yield and reproducibility in a CMOS process, paves the way toward truly large-scale quantum photonic circuits by allowing sources and detectors of single photons to be integrated on the same chip.