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Conference 12009 > Paper 12009-66
Paper 12009-66

Multi-channel waveguide-integrated superconducting nanowire single-photon detector system for ultrafast quantum key distribution

Abstract

Upcoming quantum technologies require scalable and cost-efficient technical solutions for widespread functionality. In order to exploit the quantum states of light, single-photon detectors are essential for application. Here, we present a low-footprint plug-and-play multi-channel single-photon detector system featuring integrated photonics that allows for ultra-fast quantum key distribution (QKD). Each channel comprises a superconducting nanowire single-photon detector (SNSPD) patterned from a niobium-titanium nitride (NbTiN) superconducting film atop silicon nitride waveguide structures [1]. Subsequently, the on-chip photonics are interfaced by broadband 3D polymeric fiber-to-chip couplers[2] to the ports of an 8x8 fiber array. The readout electronics allow for individual evaluation of up to 64 channels simultaneously. Integrated to a QKD experiment, a pair of the system's detection channels achieves secret key rates of up to 2.5\,Mbit/s employing a coherent one-way protocol. [1] S. Ferrari, C. Schuck, W. Pernice, Nanophotonics, 7(11), 1725-1758 (2018) [2] H. Gehring, A. Eich, C. Schuck, and W. H. P. Pernice, Opt. Lett, 44(20), 5089-5092 (2019)

Presenter

Westfälische Wilhelms-Univ. Münster (Germany)
Presenter/Author
Westfälische Wilhelms-Univ. Münster (Germany)
Author
Matthias Häußler
Westfälische Wilhelms-Univ. Münster (Germany)
Author
Westfälische Wilhelms-Univ. Münster (Germany)
Author
Martin Wolff
Westfälische Wilhelms-Univ. Münster (Germany)
Author
Fabian Beutel
Westfälische Wilhelms-Univ. Münster (Germany)
Author
Westfälische Wilhelms-Univ. Münster (Germany)
Author
Wladick Hartmann
Westfälische Wilhelms-Univ. Münster (Germany)
Author
Max Tillmann
PicoQuant GmbH (Germany)
Author
PicoQuant GmbH (Germany)
Author
Tino Röhlicke
PicoQuant GmbH (Germany)
Author
PicoQuant GmbH (Germany)
Author
Entropy GmbH (Germany)
Author
Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)
Author
Jasper Rödiger
Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)
Author
Carsten Schuck
Westfälische Wilhelms-Univ. Münster (Germany)
Author
Westfälische Wilhelms-Univ. Münster (Germany)