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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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Related Experiment Video

Updated: Sep 8, 2025

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

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

Published on: August 2, 2019

Superconducting-qubit readout via low-backaction electro-optic transduction.

R D Delaney^1,2, M D Urmey^3,4, S Mittal^3,4

¹JILA, National Institute of Standards and Technology and the University of Colorado, Boulder, CO, USA. robert.delaney@colorado.edu.

|June 15, 2022

Summary

This summary is machine-generated.

Researchers demonstrate a low-backaction transducer for reading out superconducting transmon qubits using optical light. This breakthrough advances quantum communication and distributed quantum computing by minimizing interference with sensitive quantum states.

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Last Updated: Sep 8, 2025

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Area of Science:

Quantum Computing
Quantum Communication
Superconducting Circuits

Background:

Entangling superconducting quantum processors with optical light is key for secure communication and distributed quantum information processing.
Transducing quantum signals between microwave and optical frequencies is a significant challenge.
Interfacing superconducting qubits (millikelvin temperatures) with electro-optic transducers is difficult due to optical photon interference.

Purpose of the Study:

To demonstrate a low-backaction electro-optomechanical transducer for superconducting transmon qubit readout.
To overcome challenges in interfacing superconducting qubits with optical transducers.
To enable transduction of non-classical signals from superconducting qubits to the optical domain.

Main Methods:

Utilized a modular electro-optomechanical transducer.
Employed circuit quantum electrodynamics (cQED) system.
Achieved qubit isolation from optical photons.

Main Results:

Demonstrated qubit readout through a low-backaction transducer.
Achieved complete isolation of the qubit from optical photons.
Showed transducer backaction on the qubit is lower than environmental thermal radiation.

Conclusions:

The developed transducer minimizes backaction on superconducting qubits.
Modular design enables qubit isolation, crucial for quantum information processing.
Future improvements in transducer bandwidth and noise will facilitate optical transduction of non-classical quantum signals.