Quantum detector tomography of superconducting nanostrip photon-number-resolving detector

Abstract

Superconducting nanostrip photon detectors have been used as single photon detectors, which can discriminate only photons' presence or absence. It has recently been found that they can discriminate the number of photons by analyzing the output signal waveform, and they are expected to be used in various fields, especially in optical quantum information processing. Here, we improve the photon-number-resolving performance for light with a high-average photon number by pattern matching of the output signal waveform. Furthermore, we estimate the positive-operator-valued measure of the detector by a quantum detector tomography. The result shows that the device has photon-number-resolving performance up to five photons without any multiplexing or arraying, indicating that it is useful as a photon-number-resolving detector.

arXiv comment11 pages, 5 figures

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• Linearly Multiplexed Photon Number Resolving Single-photon Detectors Array
• CHSH Bell Tests For Optical Hybrid Entanglement
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• Quantum communications in continuous variable systems
• Fundamental limits on determination of photon number statistics from measurements with multiplexed on/off detectors
• Precision Bounds for Characterising Quantum Measurements
• Scalable quantum detector tomography by high-performance computing
• Practical considerations for assignment of photon numbers with SNSPDs