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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Superconductor-superconductor bilayers for enhancing single-photon detection.

Yachin Ivry^1,2,3, Jonathan J Surick³, Maya Barzilay^1,2

¹Department of Materials Science & Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel.

|August 30, 2017

Summary

This summary is machine-generated.

We developed hybrid superconducting nanowire single-photon detectors (SNSPDs) using ultrathin films. These detectors achieve excellent timing and high efficiency, advancing superconducting technologies.

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Area of Science:

Materials Science
Quantum Optics
Condensed Matter Physics

Background:

Superconducting nanowire single-photon detectors (SNSPDs) are crucial for quantum information processing.
Optimizing SNSPD performance requires balancing timing resolution and detection efficiency.
Ultrathin superconducting films are key to achieving high-performance SNSPDs.

Purpose of the Study:

To optimize ultrathin films of granular Niobium Nitride (NbN) and amorphous Tungsten-Silicon (αW5Si3).
To investigate the performance of hybrid SNSPDs combining NbN and αW5Si3.
To understand the proximity effect governing the hybridization of these superconducting materials.

Main Methods:

Fabrication of ultrathin granular NbN films on SiO2.
Deposition of ultrathin amorphous αW5Si3 films on NbN films.
Characterization of hybrid SNSPD performance, including timing jitter, reset time, and quantum efficiency.

Main Results:

Hybrid SNSPDs with 2 nm αW5Si3 over 2 nm NbN films demonstrated <5 ns reset time and 52 ps timing jitter.
Achieved quantum efficiency exceeded 96% at a 1550 nm optical wavelength.
Proximity effect was identified as the governing mechanism for the enhanced performance.

Conclusions:

Hybrid SNSPDs offer a promising route to simultaneously achieve excellent timing and high efficiency.
This hybridization strategy can expand the range of superconducting properties for nano-superconducting devices.
The approach allows for tuning superconducting film properties, such as amorphous character.