Photon number-resolving detectors (PNRDs) are the ultimate optical sensors. Superconducting-nanostrip photon detectors (SNSPDs), traditionally known as ON-OFF detectors, have recently been found to have photon number resolving capability without multiplexing. This discovery positions them to become true PNRDs. However, their practical use is limited by the need to precisely detect tiny signal differences with low signal-to-noise ratios within sub-nanosecond time frames. We overcome this challenge using optical sampling with a dual-output Mach Zehnder modulator (DO-MZM) and ultra-short pulsed laser. By adjusting the DO-MZM's bias voltage to nearly balance the outputs, this method enables sensitive detection of picosecond-order signal differences, achieving a temporal resolution of 1.9 ps and facilitating real-time photon number resolution. We applied this method to produce various non-classical quantum states, enhancing their non-classicality through photon number resolution. This advancement marks a significant shift from principle verification to practical application for SNSPD-type PNRDs in diverse quantum optics fields.
@article{arxiv.2405.06901,
title = {Optically-Sampled Superconducting-Nanostrip Photon-Number Resolving Detector for Non-Classical Quantum State Generation},
author = {Mamoru Endo and Kazuma Takahashi and Takefumi Nomura and Tatsuki Sonoyama and Masahiro Yabuno and Shigehito Miki and Hirotaka Terai and Takahiro Kashiwazaki and Asuka Inoue and Takeshi Umeki and Rajveer Nehra and Kan Takase and Warit Asavanant and Akira Furusawa},
journal= {arXiv preprint arXiv:2405.06901},
year = {2025}
}