Evaluating a Multi-Color Entangled-Photon Source for a Bosonic Silicon Quantum Circuit

TL;DR

This paper evaluates a multi-color entangled-photon source in silicon for use in bosonic quantum circuits, demonstrating its feasibility and potential for integrated quantum technologies.

Contribution

It introduces a silicon-based multi-color photon source for bosonic circuits and demonstrates quantum interference and state tomography in this system.

Findings

Successful generation of spatially entangled photon states in silicon

Quantum interference observed between signal and idler photons

Quantum state tomography confirms the feasibility of the source

Abstract

We evaluated a multi-color two-photon entangled state generated in silicon via spontaneous four-wave mixing (SFWM) as a potential source for bosonic integrated circuits. Spatially entangled photon states were created using a pair of silicon waveguides that produced signal and idler photons through SFWM, allowing us to observe quantum interference between them. Assuming that the frequencies of the multi-color photons were nearly identical, we characterized the generated quantum state by performing quantum state tomography on the bosonic system using a linear optical circuit. This study demonstrates the feasibility of using photon-pair sources generated in silicon via SFWM in bosonic optical circuits and highlights their potential for a wide range of applications in silicon-based optical quantum technologies.