On-Chip Quantum Interference from a Single Silicon Ring Resonator Source

TL;DR

This paper demonstrates on-chip quantum interference using a single silicon ring resonator source integrated with a Mach-Zehnder interferometer, achieving high visibility and tunability, advancing integrated quantum photonics.

Contribution

It introduces a seamlessly integrated silicon chip that generates and manipulates entangled photons with high interference visibility, simplifying complex quantum photonic circuit integration.

Findings

Achieved high two-photon interference visibility of ~96%.

Demonstrated tunable quantum interference across multiple ring resonances.

Showed integration of photon source and interferometer on a single silicon chip.

Abstract

Here we demonstrate quantum interference of photons on a Silicon chip produced from a single ring resonator photon source. The source is seamlessly integrated with a Mach-Zehnder interferometer, which path entangles degenerate bi-photons produced via spontaneous four wave mixing in the Silicon ring resonator. The resulting bi-photon N00N state is controlled by varying the relative phase of the integrated Mach-Zehnder interferometer, resulting in high two-photon interference visibilities of V~96%. Furthermore, we show that the interference can be produced using pump wavelengths tuned to all of the ring resonances accessible with our tunable lasers (C+L band). This work is a key demonstration towards the simplified integration of multiple photon sources and quantum circuits together on a monolithic chip, in turn, enabling quantum information chips with much greater complexity and functionality.