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APL Photonics

Research trends in single-photon detectors based on superconducting wires

Francesco P. Venza, Marco Colangelo

Published Apr 1, 2025• 21 citations
Publisher

Abstract

Superconducting nanowire single-photon detectors (SNSPDs) are the leading technology for photon counting at near-infrared wavelengths, offering unparalleled performance across multiple metrics and enabling diverse applications. Two decades after their introduction, SNSPDs have made significant progress and reached a mature stage of development. However, the requirements of new, demanding applications and the push to democratize this technology open up new opportunities for further advancements. In this perspective, we provide an introduction to SNSPD technology, an overview of current research trends, and insights into future directions in this field.

DOI
10.1063/5.0246490

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Superconducting nanowire single-photon detectors (SNSPDs) are the leading technology for photon counting at near-infrared wavelengths, offering unparalleled performance across multiple metrics and enabling diverse applications. Two decades after their introduction, SNSPDs have made significant progress and reached a mature stage of development. However, the requirements of new, demanding applications and the push to democratize this technology open up new opportunities for further advancements. In this perspective, we provide an introduction to SNSPD technology, an overview of current research trends, and insights into future directions in this field.
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Superconducting nanowire single photon detectors (SNSPDs) are a highly promising emerging photon counting technology, offering infrared sensitivity combined with low dark count rates and sub-100 ps timing jitter [1]. These devices are under consideration for a wide variety of photon counting applications, from quantum cryptography to remote sensing. Next generation device designs based on optical cavities, ultra narrow wires, parallel wire arrays and nano-antenna enhanced devices are being evaluated to meet the demands of advanced photon counting applications.
Superconducting Nanowire Single Photon Detectors (SNSPDs) are the most advanced detectors available for time-resolved single photon counting from the UV to the mid-infrared. We will discuss recent progress in SNSPD development for the ground terminal in NASA’s Deep Space Optical Communication (DSOC) project as well as recent performance advances in other metrics, including the development of kilopixel SNSPD arrays, single-photon sensitivity at mid-infrared wavelengths as long as 10 microns, and SNSPDs with sub-3ps timing jitter. I will discuss a range of new potential scientific applications for SNSPDs, including exoplanet transit spectroscopy, dark matter detection, fluorescence lifetime imaging microscopy, and quantum information science.
We present an overview of recent results for new generation of infrared and optical superconducting nanowire single-photon detectors (SNSPDs) that has already demonstrated a performance that makes them devices-of-choice for many applications. SNSPDs provide high efficiency for detecting individual photons while keeping dark counts and timing jitter minimal. Besides superior detection performance over a broad optical bandwidth, SNSPDs are also compatible with an integrated optical platform as a crucial requirement for applications in emerging quantum photonic technologies. By embedding SNSPDs in nanophotonic circuits we realize waveguide integrated single photon detectors which unite all desirable detector properties in a single device.
Since the first report on superconducting nanowire single photon detector (SNSPD) in 2001, it has turned to be a‘hotspot’in superconducting electronics. As a novel single photon detector (SPD), SNSPD outperforms the traditional semiconducting SPDs in near infrared wavelength with high detection efficiency, low dark count rate, low timing jitter, high counting rate, wide response waveband and simple circuit etc. In this review we give a brief introduction of materials, fabrication process, properties, system integration and frontier applications of SNSPD from the point of view of application, and also discuss the challenge and future development trend of this field.