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Laser Physics Letters

Quantum tomography of a photon-number-resolving detector based on continuous time multiplexing: memory effect

G. V. Avosopiants, Konstantin G. Katamadze, N. A. Borshchevskaya, Yu. I. Bogdanov, S. P. Kulik

Published Aug 21, 2024• 1 citation
Publisher

Abstract

Abstract We address the characterization of a photon-number-resolving detector based on continuous time multiplexing. We develop and verify a mathematical model of this detector and explore various approaches to its quantum tomography. Additionally, we encounter a memory effect and discuss the feasibility of describing this type of detector using a transfer matrix or positive operator-valued measure (POVM) decomposition.

DOI
10.1088/1612-202x/ad6e69

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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.
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