Scalable multiphoton generation from cavity-synchronized single-photon sources

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, all interacting 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. In a state-of-the-art circuit QED implementation, this scheme supports the creation of single photons with <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mn>99</a:mn><a:mo>%</a:mo></a:mrow></a:math> purity, indistinguishability, and efficiency at rates of <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mo>∼</b:mo><b:mspace width="0.16em"/><b:mi>MHz</b:mi></b:mrow></b:math>. 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 multiphoton sources and scalable quantum information processing with photons.