Experimental investigation of the detection mechanism in WSi nanowire superconducting single photon detectors

Abstract

We use quantum detector tomography to investigate the detection mechanism in WSi nanowire superconducting single photon detectors (SSPDs). To this purpose, we fabricated a 250nm wide and 250nm long WSi nanowire and measured its response to impinging photons with wavelengths ranging from $\lambda$ = 900 nm to $\lambda$ = 1650 nm. Tomographic measurements show that the detector response depends on the total excitation energy only. Moreover, for energies Et > 0.8eV the current energy relation is linear, similar to what was observed in NbN nanowires, whereas the current-energy relation deviates from linear behaviour for total energies below 0.8eV.

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Cited by in corpus (10)

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• Determining the depairing current in superconducting nanowire single-photon detectors
• Optically probing the detection mechanism in a molybdenum silicide superconducting nanowire single-photon detector
• Universal Model for the Turn-on Dynamics of Superconducting Nanowire Single-Photon Detectors
• Non-bolometric bottleneck in electron-phonon relaxation in ultra-thin WSi film
• Ion trap architectures and new directions
• Experimental investigation of the detection mechanism in WSi nanowire superconducting single photon detectors
• High-resistivity niobium nitride films for unity-efficiency SMSPDs at telecom wavelengths and beyond