Superconducting Single-Photon Detectors: Twenty Plus Years of Development and Applications

Explore the evolution and applications of superconducting single-photon detectors (SSPDs) in this comprehensive 55-minute seminar presented by Roman Sobolewski from the University of Rochester. Delve into the physics behind SSPDs, invented in 2001, and learn how they have become the leading technology for high-performance single-photon detection, counting, and imaging. Discover the unique detection mechanism based on photon-induced hotspot formation and voltage transient generation across superconducting nanostripe meanders. Understand the advantages of SSPDs operating at cryogenic temperatures (2-5 K range) and how they outperform competing devices, particularly in the telecommunication wavelength. Gain insights into practical implementations of SSPDs across various fields, including quantum communication, cryptography, medical optical tomography, LIDAR, and noninvasive testing of VLSI integrated circuits. Conclude with a discussion on potential future directions for superconducting single-photon detector technology.