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Superconductor

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...

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

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Published on: August 2, 2019

Quantum Microwave Radiometry with a Superconducting Qubit.

Zhixin Wang¹, Mingrui Xu², Xu Han²

¹Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA.

Physical Review Letters

|May 21, 2021

Summary

This summary is machine-generated.

We developed a quantum radiometer using superconducting qubits to detect microwave radiation at the single-photon level. This tool precisely measures resonator temperature, aiding quantum circuit thermodynamics and dark matter detection.

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Area of Science:

Quantum physics
Thermodynamics
Electromagnetic radiation sensing

Background:

Photon-matter interactions are key for sensitive radiation detection.
Superconducting qubits offer precise quantum control.

Purpose of the Study:

To introduce a quantum radiometer for sensing microwave radiation at the subunit photon level.
To demonstrate its application in measuring quantum microwave circuit thermodynamics.

Main Methods:

Utilizing a superconducting qubit and photon-induced dephasing.
Applying the radiometer to a 1 K microwave resonator.
Measuring resonator mode temperature with high precision.

Main Results:

Demonstrated radiative cooling of a microwave resonator.
Measured resonator mode temperature with an uncertainty of ~0.01 K.
Developed a precise tool for quantum microwave circuit thermodynamics.

Conclusions:

The quantum radiometer precisely measures microwave radiation and resonator temperature.
It offers new solutions for calibrating quantum systems.
It can be used for detecting dark matter candidate particles.