Scalable multiphoton generation from cavity-synchronized single-photon sources

TL;DR

This paper introduces a scalable, deterministic scheme for generating multiple indistinguishable photons simultaneously using cavity-synchronized single-photon sources, significantly advancing quantum photonics for scalable quantum computing.

Contribution

The authors present a novel cavity-based synchronization method enabling efficient, on-demand multi-photon generation with high purity and indistinguishability, surpassing previous demultiplexing approaches.

Findings

Supports creation of 99% pure, indistinguishable photons at MHz rates

Can produce up to 100 photons simultaneously with hundreds of kHz rates

Orders of magnitude improvement over previous boson sampling sources

Abstract

We propose an efficient, scalable, and deterministic scheme to generate multiple indistinguishable photons over independent channels, on demand. Our design relies on multiple single-photon sources, each coupled to a waveguide, and all of them interact with a common cavity mode. The cavity synchronizes and triggers the simultaneous emission of one photon by each source, which are collected by the waveguides. For a state-of-the-art circuit QED implementation, this scheme supports the creation of single photons with purity, indistinguishability, and efficiency of $99\%$ at rates of $\sim $MHz. We also discuss conditions to produce up to 100 photons simultaneously with generation rates of hundreds of kHz. This is orders of magnitude more efficient than previous demultiplexed sources for boson sampling and enables the realization of deterministic multi-photon sources and scalable quantum information processing with photons.