Quantum non-Gaussianity of frequency up-converted single photons

TL;DR

This paper demonstrates the first certification of quantum non-Gaussianity in frequency up-converted single photons, advancing quantum communication by enabling nonclassical states to be converted across different frequencies.

Contribution

It introduces a method to generate and certify quantum non-Gaussianity in frequency up-converted single photons, a novel achievement in quantum optics.

Findings

Successfully generated heralded single photons at 1550 nm

Achieved frequency up-conversion to 532 nm

Experimentally certified quantum non-Gaussianity in the up-converted states

Abstract

Nonclassical states of light are an important resource in today's quantum communication and metrology protocols. Quantum up-conversion of nonclassical states is a promising approach to overcome frequency differences between disparate subsystems within a quantum information network. Here, we present the generation of heralded narrowband single photons at 1550 nm via cavity enhanced spontaneous parametric downconversion (SPDC) and their subsequent up-conversion to 532 nm. Quantum non-Gaussianity (QNG), which is an important feature for applications in quantum information science, was experimentally certified for the first time in frequency up-converted states.