BosonSampling with single-photon Fock states from a bright solid-state source

TL;DR

This paper demonstrates a BosonSampling device using a highly efficient solid-state single-photon source, achieving faster and more reliable quantum sampling than previous methods based on less efficient sources.

Contribution

The authors realize BosonSampling with a deterministic quantum dot source, significantly improving efficiency over traditional heralded sources and enabling faster experiments.

Findings

Achieved high single-photon purity of 0.990.

Demonstrated a more efficient BosonSampling implementation.

Completed the experiment faster than previous similar setups.

Abstract

A BosonSampling device is a quantum machine expected to perform tasks intractable for a classical computer, yet requiring minimal non-classical resources as compared to full-scale quantum computers. Photonic implementations to date employed sources based on inefficient processes that only simulate heralded single-photon statistics when strongly reducing emission probabilities. BosonSampling with only single-photon input has thus never been realised. Here, we report on a BosonSampling device operated with a bright solid-state source of single-photon Fock states with high photon-number purity: the emission from an efficient and deterministic quantum dot-micropillar system is demultiplexed into three partially-indistinguishable single-photons, with a single-photon purity $1{-}g^{(2)}(0)$ of $0.990{\pm}0.001$, interfering in a linear optics network. Our demultiplexed source is between one and two orders-of-magnitude more efficient than current heralded multi-photon sources based on spontaneous parametric downconversion, allowing us to complete the BosonSampling experiment faster than previous equivalent implementations.