Certification of the genuine resolution of photon number resolving detectors

• URL: http://arxiv.org/abs/2606.14365v1
• Date: Fri, 12 Jun 2026 11:48:39 GMT
• Title: Certification of the genuine resolution of photon number resolving detectors
• Abstract summary: We introduce an operational framework for quantifying the capability of a PNR detector to distinguish between different numbers of photons.<n>We develop a practical and scalable protocol for certifying the genuine resolution of a detector.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Photon-number-resolving (PNR) detectors are essential components of photonic quantum technologies, yet thus far, no practical metric exists to certify how many photons they can genuinely resolve in a single measurement. Here we introduce an operational framework for quantifying the capability of a PNR detector to distinguish between different numbers of photons, i.e. its genuine resolution. In turn, we develop a practical and scalable protocol for certifying the genuine resolution of a detector, which is based on coherent state probes. We apply the method to a 28-pixel photon-number-resolving superconducting nanowire single-photon detector (PNR-SNSPD) and certify genuine four-outcome resolution. Our work highlights the critical requirements in terms of detector efficiency towards achieving high genuine resolution. This approach provides an operational benchmark for PNR detectors and fills a crucial gap in the characterization of photonic quantum devices.

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