Losses resistant verification of quantum non-Gaussian photon statistics

TL;DR

This paper introduces a loss-mitigated verification method using quantum non-Gaussian witnesses that effectively accounts for optical losses and detector inefficiencies, enabling reliable detection of quantum non-Gaussian states.

Contribution

It presents a novel verification technique that incorporates known losses into quantum non-Gaussian witnesses, improving detection reliability under realistic experimental conditions.

Findings

Successfully verified unheralded quantum non-Gaussian states

Demonstrated robustness against optical losses and detector inefficiencies

Enhanced detection capabilities for quantum states in practical setups

Abstract

Quantum non-Gaussian states of light have fundamental properties that are essential for a multitude of applications in quantum technology. However, many of these features are difficult to detect using standard criteria due to optical losses and detector inefficiency. As the statistics of light are unknown, the loss correction on the data is unreliable, despite the fact that the losses can be precisely measured. To address this issue, we employ a loss-mitigated verification technique utilising quantum non-Gaussian witnesses, which incorporate the known optical losses and detector inefficiency into their derivation. This approach allows us to address the considerable challenge of experimentally demonstrating unheralded quantum non-Gaussian states of single photons and photon pairs.