Time-Multiplexed Measurements of Nonclassical Light at Telecom Wavelengths

TL;DR

This paper demonstrates the experimental reconstruction of nonclassical light properties at telecom wavelengths using a time-multiplexed detector, achieving high precision in characterizing ultrafast pulsed quantum states.

Contribution

It introduces a novel application of photon-number-resolving time-multiplexed detection combined with data-pattern tomography for precise quantum state characterization at telecom wavelengths.

Findings

High-fidelity reconstruction of nonclassical light states

Almost perfect photon-number correlations observed

Enhanced measurement precision with time-multiplexed detection

Abstract

We report the experimental reconstruction of the statistical properties of an ultrafast pulsed type-II parametric down conversion source in a periodically poled KTP waveguide at telecom wavelengths, with almost perfect photon-number correlations. We used a photon-number-resolving time-multiplexed detector based on a fiber-optical setup and a pair of avalanche photodiodes. By resorting to a germane data-pattern tomography, we assess the properties of the nonclassical light states states with unprecedented precision.