High-visibility nonclassical interference between pure heralded single photons and weak coherent photons

TL;DR

This paper demonstrates high-visibility nonclassical interference between spectrally pure heralded single photons and weak coherent photons, advancing quantum optics experiments involving different photon states.

Contribution

First experimental demonstration of high-visibility interference between pure heralded single photons and weak coherent photons, enabling new quantum information applications.

Findings

Interference visibility of 89.4% achieved

Spectrally pure single photons can interfere with coherent states

Lays groundwork for future quantum interference experiments

Abstract

We present an experiment of nonclassical interference between a pure heralded single-photon state and a weak coherent state. Our experiment is the first to demonstrate that spectrally pure single photons can have high interference visibility, 89.4 \pm 0.5%, with weak coherent photons. Our scheme lays the groundwork for future experiments requiring quantum interference between photons in nonclassical states and those in coherent states.