Silicon Quantum Photonics

Nobuyuki Matsuda, Hiroki Takesue

Abstract Integrated quantum photonics is now seen as one of the promising approaches to realize scalable quantum information systems. With optical waveguides based on silicon photonics technologies, we can realize quantum optical circuits with a higher degree of integration than with silica waveguides. In addition, thanks to the large nonlinearity observed in silicon nanophotonic waveguides, we can implement active components such as entangled photon sources on a chip. In this paper, we report recent progress in integrated quantum photonic circuits based on silicon photonics. We review our work on correlated and entangled photon‐pair sources on silicon chips, using nanoscale silicon waveguides and silicon photonic crystal waveguides. We also describe an on‐chip quantum buffer realized using the slow‐light effect in a silicon photonic crystal waveguide. As an approach to combine the merits of different waveguide platforms, a hybrid quantum circuit that integrates a silicon‐based photon‐pair source and a silica‐based arrayed waveguide grating is also presented.

Damien Bonneau, Joshua W. Silverstone, Mark G. Thompson

Stefano Paesani, Anthony Laing

Lukasz Komza, Polnop Samutpraphoot, Mutasem Odeh +8 more

Silicon is the ideal material for building electronic and photonic circuits at scale. Integrated photonic quantum technologies in silicon offer a promising path to scaling by leveraging advanced semiconductor manufacturing and integration capabilities. However, the lack of deterministic quantum light sources and strong photon-photon interactions in silicon poses a challenge to scalability. In this work, we demonstrate an indistinguishable photon source in silicon photonics based on an artificial atom. We show that a G center in a silicon waveguide can generate high-purity telecom-band single photons. We perform high-resolution spectroscopy and time-delayed two-photon interference to demonstrate the indistinguishability of single photons emitted from a G center in a silicon waveguide. Our results show that artificial atoms in silicon photonics can source single photons suitable for photonic quantum networks and processors.

Ding Y, Bacco D., Rottwitt K. +3 more

Quantum photonics opens a new era of technology revolution deeply embedded in quantum mechanism. Silicon integrated quantum photonics is of particular interest able to integrate mass of quantum photonic components on a single silicon chip. Here we present our recent work on silicon photonics for advanced quantum applications, including high-dimensional quantum quantum key distribution, high-dimensional quantum entanglement, and Hong-Ou-Mandel interference of two independent lasers on silicon for quantum communication.

Takesue, Harada, Fukuda +5 more