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

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arxiv 1602.07659 v2 pith:SECG4WFT submitted 2016-02-24 cond-mat.mes-hall physics.opticsquant-ph

classification cond-mat.mes-hallphysics.opticsquant-ph
keywords nanowiredetectiondetectordetectorsenergiesenergylambdalinear
verification ladder T0 review T1 audit T2 compute T3 formal
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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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