Optimizing photon-number resolution with superconducting nanowire multi-photon detectors
Timon Schapeler, Fabian Schlue, Michael Stefszky, Benjamin Brecht, Christine Silberhorn, Tim J. Bartley

TL;DR
This paper reviews the current state of photon-number resolution using superconducting nanowire detectors, introduces a new criterion for resolvability, and discusses experimental techniques to enhance PNR capabilities.
Contribution
It provides a comprehensive overview of PNR with SNSPDs and introduces a novel resolvability criterion for improved photon detection accuracy.
Findings
Summarizes current SNSPD PNR techniques
Proposes a new resolvability criterion for PNR
Highlights experimental approaches to enhance photon resolution
Abstract
In this paper we briefly review the state-of-the-art of intrinsic photon-number resolution (PNR) with superconducting nanowire single-photon detectors (SNSPDs) and will provide an overview of the various experimental techniques employed to achieve PNR. Additionally, we introduce a resolvability criterion to PNR based on SNSPDs.
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