Ultrasensitive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi></mml:math>-Photon Interferometric Autocorrelator

Zhou, Zili; Frucci, G.; Mattioli, F.; Gaggero, A.; Leoni, R.; Jahanmirinejad, S.; Hoang, Thang B.; Fiore, Andrea

doi:10.1103/physrevlett.110.133605

Cited by 32 publications

(36 citation statements)

References 33 publications

(38 reference statements)

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“…It is crucial for this experiment that the pulse duration is shorter than the lifetime of an excitation, which was measured to be several tens of picoseconds 19,25,35 . If the pulse duration is longer than that, it is possible to have a pulse which produces two excitations which are far enough apart in time that one has died out before the second is created; this will therefore not result in a multiphoton excitation.…”

Section: Methodsmentioning

confidence: 99%

Universal response curve for nanowire superconducting single-photon detectors

et al. 2013

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Using detector tomography, we investigate the detection mechanism in NbN-based superconducting single photon detectors (SSPDs). We demonstrate that the detection probability uniquely depends on a particular linear combination of bias current and energy, for a large variation of bias currents, input energies and detection probabilities, producing a universal detection curve. We obtain this result by studying multiphoton excitations in a nanodetector with a sparsity-based tomographic method that allows factoring out of the optical absorption. We discuss the implication of our model system for the understanding of meander-type SSPDs.

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Section: Methodsmentioning

confidence: 99%

Universal response curve for nanowire superconducting single-photon detectors

et al. 2013

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“…In a bias current range from 0.45 to 0.65 I b /I c , the excitation lifetime changes by an order of magnitude. In contrast, in NbN [31,32], the lifetime is constant over a similar range of bias currents (0.3 -0.55 I b /I c ).…”

mentioning

confidence: 98%

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

Gaudio

Renema

Zhou

et al. 2016

Applied Physics Letters

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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 λ = 900 nm to λ = 1650 nm. Tomographic measurements show that the detector response depends on the total excitation energy only. Moreover, for total absorbed energies > 0.8eV the currentenergy 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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“…In particular, the pulses which the light source sends out should be shorter than the lifetime of an excitation in the detector. This number can be determined in a separate experiment [121] and is 20 ps for NbN SNSPDs. Moreover, the pulses should be separated by more than the dead time of the detector, to make sure that each individual pulse corresponds to a separate probing of the detector, uncorrelated to the previous ones.…”

Section: Appendix A2 Experimental Considerationsmentioning

confidence: 99%

Detection mechanism of superconducting nanowire single-photon detectors

Engel¹,

Renema²,

Ilin³

et al. 2015

Supercond. Sci. Technol.

139

111

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Abstract. In this paper we intend to give a comprehensive description of the current understanding of the detection mechanism in superconducting nanowire singlephoton detectors. We will review key experimental results related to the detection mechanism, e.g. the variations of the detection probability as a function of bias current, temperature or magnetic field. Commonly used detection models will be introduced and we will analyze their predictions in view of the experimental observations. Although none of the proposed detection models is able to describe all experimental data, it is becoming increasingly clear that vortices are essential for the formation of the initial normal-conducting domain that triggers a detection event.

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UltrasensitiveN-Photon Interferometric Autocorrelator

Cited by 32 publications

References 33 publications

Universal response curve for nanowire superconducting single-photon detectors

Universal response curve for nanowire superconducting single-photon detectors

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

Detection mechanism of superconducting nanowire single-photon detectors

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