Feasibility study towards comparison of the g^(2)(0) measurement in the visible range

TL;DR

This pilot study compares g^(2)(0) measurements of a single-photon source in the visible range across three laboratories, highlighting the feasibility and challenges of standardizing such quantum optical measurements.

Contribution

The paper presents the first collaborative comparison of g^(2)(0) measurements in the visible spectrum for single-photon sources, demonstrating the feasibility of cross-laboratory standardization.

Findings

Measurement consistency across laboratories was achieved within experimental uncertainties.

The study identified key factors affecting measurement accuracy in the visible range.

Results support the development of standardized protocols for quantum optical measurements.

Abstract

This work reports on the pilot study, performed by INRIM, NPL and PTB, on the measurement of the g^(2)(0) parameter in the visible spectral range of a test single-photon source based on a colour centre in diamond. The development of single-photon sources is of great interest to the metrology community as well as the burgeoning quantum technologies industry. Measurement of the g^(2)(0) parameter plays a vital role in characterising and understanding single-photon emission. This comparison has been conducted by each partner individually using its own equipment at INRIM laboratories, which were responsible for the operation of the source