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Infrared single-photon detection with superconducting magic-angle twisted bilayer graphene.

Giorgio Di Battista¹, Kin Chung Fong^2,3, Andrés Díez-Carlón¹

¹Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, München 80799, Germany.

Science Advances

|September 18, 2024

Summary

This summary is machine-generated.

Magic-angle twisted bilayer graphene (MATBG) is a novel superconductor with ultralow carrier density. This unique material demonstrates exceptional sensitivity for detecting single near-infrared photons, paving the way for advanced quantum sensors.

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Area of Science:

Condensed Matter Physics
Quantum Technologies

Background:

Magic-angle twisted bilayer graphene (MATBG) exhibits unique superconducting properties.
Its ultralow carrier density (~10^11 cm^-2) leads to low heat capacity and high kinetic inductance.
These properties are promising for advanced quantum sensing applications.

Purpose of the Study:

To demonstrate the potential of MATBG for single near-infrared photon detection.
To investigate the interaction between MATBG and photons.

Main Methods:

Fabrication of a MATBG device.
Voltage biasing the device near its superconducting phase transition.
Irradiating the device with single near-infrared photons.

Main Results:

Complete destruction of the superconducting state was observed upon single photon absorption.
Exceptional sensitivity was demonstrated even in a 16-square micrometer device.
Insights into MATBG-photon interactions were gained.

Conclusions:

MATBG is a highly sensitive platform for single-photon detection.
Moiré superconductors offer a promising route for developing revolutionary quantum devices and sensors.