Compound twin beams without the need of genuine photon-number-resolving detection

TL;DR

This paper introduces a method to generate stronger multi-mode twin beams using multiple weak twin beams detected with simple on/off detectors, enabling non-classical light applications without complex photon-number-resolving detectors.

Contribution

The study presents a novel scheme for creating compound twin beams that exhibit non-classical properties without requiring photon-number-resolving detection, supported by a new theoretical model.

Findings

Compound twin beams exhibit non-classicality at high intensities.

They can generate sub-Poissonian light and enable sub-shot-noise absorption measurements.

Theoretical model successfully interprets experimental data.

Abstract

The scheme for building stronger multi-mode twin beams from a greater number of identical twin beams sufficiently weak so that single-photon sensitive on/off detectors suffice in their detection is studied. Statistical properties of these compound twin beams involving the non-classicality are analyzed for intensities up to hundreds of photon pairs. Their properties are compared with those of the genuine twin beams that require photon-number-resolving detectors in their experimental investigations. The use of such compound twin beams for the generation of sub-Poissonian light and measurement of absorption with sub-shot-noise precision is analyzed. A suitable theoretical model for the compound twin beams is developed to interpret the experimental data.