A high-fidelity single-photon source based on a type-II optical parametric oscillator

TL;DR

This paper presents a high-fidelity single-photon source using a continuous-wave type-II optical parametric oscillator, achieving 79% fidelity with potential for quantum information applications.

Contribution

It introduces a novel heralded single-photon source with high fidelity and well-defined mode using a continuous-wave type-II optical parametric oscillator.

Findings

Achieved 79% fidelity with a single-photon state

Homodyne detection characterized the generated state

Low vacuum admixture and well-defined mode demonstrated

Abstract

Using a continuous-wave type-II optical parametric oscillator below threshold, we have demonstrated a novel source of heralded single-photons with high-fidelity. The generated state is characterized by homodyne detection and exhibits a 79% fidelity with a single-photon Fock state (91% after correction of detection loss). The low admixture of vacuum and the well-defined spatiotemporal mode are critical requirements for their subsequent use in quantum information processing.