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Q: Fachverband Quantenoptik und Photonik

Q 40: Quantum Optics and Nuclear Quantum Optics II

Q 40.1: Vortrag

Mittwoch, 12. März 2025, 14:30–14:45, AP-HS

From click counts to photon numbers — •Suchitra Krishnaswamy, Fabian Schlue, Laura Ares, Vladymir Dyachuk, Michael Stefszky, Benjamin Brecht, Christine Silberhorn, and Jan Sperling — Paderborn University, Institute for Photonic Quantum Systems (PhoQS), Warburger Straße 100, 33098 Paderborn, Germany

Photon-number measurements are a cornerstone in quantum photonics, making photon-number-resolving detectors an essential tool. Because of wider accessibility, imperfect detectors, one of them being click detectors, are often used. Click detectors register a click irrespective of the number of incoming photons, and no click otherwise, thus displaying statistical properties different from common detection models. Utilizing click counting theory, photon statistics were reconstructed via an analytic pseudo-inversion method. Theoretically, this approach can be extended to higher click-number-resolving detectors. A reconfigurable time-bin multiplexing, click-counting detector is experimentally implemented. We gauge the success of the pseudo-inversion by applying the Mandel and binomial parameters that help in distinguishing quantum statistics.In the case of coherent light (classical-nonclassical boundary), both parameters are highly sensitive measures, hence a perfect way to gauge the reconstruction performance. Additionally, we apply a deconvolution technique to account for detection losses.

Keywords: Detector theory; Photonics; Detector tomography