Dispersion engineering of superconducting waveguides for multi-pixel integration of single-photon detectors
Ali W. Elshaari (AlbaNova University Center)
Adrian Iovan (AlbaNova University Center)
Samuel Gyger (AlbaNova University Center)
Iman Esmaeil Zadeh (TU Delft - ImPhys/Optics)
Julien Zichi (AlbaNova University Center)
Lily Yang (AlbaNova University Center)
Stephan Steinhauer (AlbaNova University Center)
Val Zwiller (AlbaNova University Center)
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Abstract
We use dispersion engineering to control the signal propagation speed in the feed lines of superconducting single-photon detectors. Using this technique, we demonstrate time-division-multiplexing of two-pixel detectors connected with a slow-RF transmission line, all realized using planar geometry requiring a single lithographic step. Through studying the arrival time of detection events in each pixel vs the fabricated slow-RF coplanar waveguide length, we extract a delay of 1.7 ps per 1 μm of propagation, corresponding to detection signal speeds of ∼0.0019c. Our results open an important avenue to explore the rich ideas of dispersion engineering and metamaterials for superconducting detector applications.
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