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Updated: Nov 8, 2025

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Josephson junction infrared single-photon detector.

Evan D Walsh^1,2, Woochan Jung³, Gil-Ho Lee^3,4

¹Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science (New York, N.Y.)

|April 23, 2021

Summary

This summary is machine-generated.

Researchers demonstrate single near-infrared photon detection using graphene Josephson junctions. This breakthrough utilizes photon-induced quasiparticles for sensitive detection, paving the way for faster optical interconnects in superconducting computers.

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Area of Science:

Quantum Computing
Superconducting Devices
Nanotechnology

Background:

Josephson junctions are vital superconducting devices for magnetometers, amplifiers, and quantum computers.
Quasiparticles, formed from broken Cooper pairs, can degrade device performance but also enable radiation detection.

Purpose of the Study:

To demonstrate single near-infrared photon detection using graphene-based Josephson junctions.
To investigate the role of quasiparticles in the photon detection mechanism.

Main Methods:

Coupling near-infrared photons to localized surface plasmons of a graphene Josephson junction.
Analyzing photon-induced switching statistics of a current-biased device.

Main Results:

Successful demonstration of single near-infrared photon detection.
Revealed the critical role of photon-generated quasiparticles in the detection process.

Conclusions:

Graphene Josephson junctions offer a novel platform for sensitive photon detection.
This technology can enable high-speed, low-power optical interconnects for advanced superconducting computing.