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Proceedings Paper

Large diameter superconducting nanowire single photon detectors (SNSPDs) with high efficiency and high time resolution (Conference Presentation)
Author(s): J. Chang; Iman Esmaeil Zadeh; Johannes W. N. Los; J. Zichi; V. Zwiller

Paper Abstract

Superconducting nanowire single photon detectors (SNSPDs) have demonstrated advantages over traditional detectors in many fields [1]. Most fiber-coupled SNSPDs are coupled to single mode fibers, limiting their usability for applications where large surface area detectors are needed, for example fluorescence detection and satellite-based quantum communication [2][3]. Other important requirements for many applications are broadband detection efficiency, and low timing jitter [4]. So far, the increased meander length of multimode detectors, and the therefore increased kinetic inductance and number of imperfections due to film inhomogeneities have limited the timing jitter [5]. Moreover, combining low timing jitter with high detection efficiency and low dark count rate in one device is challenging due to the tradeoffs between different properties of SNSPDs [6]. In this paper, we achieved high efficiency and strong saturation over a broad wavelength range with a low timing jitter of 16.99 ps while maintaining a low dark count rate of < 0.2 Hz for an SNSPD coupled to a 50 µm core multimode fiber. To enhance the broadband absorption from 405 nm to 830 nm, detectors were fabricated on an optimized SiO2 cavity and Aluminum mirror. The geometry of the nanowire was also tuned to reach a good internal saturation of efficiency over the visible/NIR range but also to carry high current to get a large signal. Furthermore, a cryogenic readout amplifier was optimized to improve the signal to noise ratio and thus lead to high time resolution. Our devices can be readily used to enable higher resolution and faster quantum optics, bio-imaging, laser ranging and other optical experiments.

Paper Details

Date Published: 13 May 2019
Proc. SPIE 11027, Quantum Optics and Photon Counting 2019, 1102705 (13 May 2019); doi: 10.1117/12.2520778
Show Author Affiliations
J. Chang, Technische Univ. Delft (Netherlands)
Iman Esmaeil Zadeh, Technische Univ. Delft (Netherlands)
Johannes W. N. Los, Single Quantum B.V. (Netherlands)
J. Zichi, KTH Royal Institute of Technology (Sweden)
V. Zwiller, KTH Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 11027:
Quantum Optics and Photon Counting 2019
Ivan Prochazka; Roman Sobolewski; Ralph B. James; Peter Domokos; Adam Gali, Editor(s)

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