Approaches to Single Photon Detection
R. T. Thew, N. Curtz, P. Eraerds, N. Walenta, J-D. Gautier, E. Koller,, J. Zhang, N. Gisin, H. Zbinden

TL;DR
This paper reviews recent advancements in various single photon detectors, including semiconductor, superconducting, and hybrid systems, highlighting their capabilities for telecom and visible wavelengths.
Contribution
It introduces new developments in single photon detection technologies across multiple platforms and wavelength regimes.
Findings
InGaAs/InP avalanche photodiodes with improved gating
Hybrid detection systems combining sum-frequency generation and Si APDs
Superconducting single photon detectors with enhanced performance
Abstract
We present recent results on our development of single photon detectors, including: gated and free-running InGaAs/InP avalanche photodiodes; hybrid detection systems based on sum-frequency generation and Si APDs; and SSPDs (superconducting single photon detectors), for telecom wavelengths; as well as SiPM (Silicon photomultiplier) detectors operating in the visible regime.
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