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Updated: May 22, 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

All-optical superconducting qubit readout.

Georg Arnold^1,2, Thomas Werner¹, Rishabh Sahu¹

¹Institute of Science and Technology Austria, Klosterneuburg, Austria.

|March 17, 2025

Summary

This summary is machine-generated.

Researchers developed a novel radio-over-fiber qubit readout system for millikelvin temperatures. This breakthrough overcomes scalability limitations in superconducting quantum hardware by enabling efficient, low-noise signal transmission without cryogenic microwave components.

Keywords:

Applied optics Qubits

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Area of Science:

Quantum Computing
Cryogenics
Optoelectronics

Background:

Superconducting quantum hardware faces scalability challenges due to stringent input-output requirements for error correction in cryogenic environments.
Existing ultracold electro-optic links for qubit control and readout have been limited by low efficiency, bandwidth, or added noise.
Classical data centers utilize fiber-optic interconnects to mitigate networking bottlenecks, inspiring similar approaches in quantum systems.

Purpose of the Study:

To develop an efficient and scalable qubit readout method for superconducting quantum hardware operating at millikelvin temperatures.
To overcome the limitations of existing electro-optic links, specifically low efficiency, bandwidth, and noise.
To demonstrate a novel radio-over-fiber approach compatible with superconducting circuits and telecom-wavelength light.

Main Methods:

Implementation of a radio-over-fiber qubit readout system operating at millikelvin temperatures.
Utilization of a single device for simultaneous upconversion and downconversion between microwave and optical frequencies.
Demonstration of all-optical single-shot readout in a circulator-free configuration.

Main Results:

Successful realization of radio-over-fiber qubit readout at millikelvin temperatures.
Elimination of the need for active or passive cryogenic microwave equipment through a single-device upconversion/downconversion system.
Demonstration of circulator-free, all-optical single-shot readout with no observed direct radiation impact on the qubit state.

Conclusions:

The developed radio-over-fiber qubit readout is compatible with superconducting circuits and telecom-wavelength light, addressing key scalability issues.
This technology is crucial for establishing modular quantum networks and enabling multiplexed readout for superconducting devices.
The approach offers a promising solution for efficient and low-noise signal transmission in future quantum computing architectures.