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Related Experiment Video

Updated: May 18, 2026

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

Heralded state preparation in a superconducting qubit.

J E Johnson¹, C Macklin, D H Slichter

¹Department of Physics, University of California, Berkeley, 94720, USA.

Physical Review Letters

|September 26, 2012

Summary

We achieved high-fidelity, single-shot readout of superconducting flux qubits, resolving states to better than 1 in 1000. Heralding ensures initialization, boosting fidelity to 93.9% and enabling fast qubit reset.

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Area of Science:

Quantum computing
Superconducting circuits
Quantum information science

Background:

Superconducting qubits are essential for quantum computation.
High-fidelity readout is critical for scalable quantum computers.
Initialization and reset protocols are key challenges in qubit operation.

Purpose of the Study:

To demonstrate high-fidelity, single-shot readout of a superconducting flux qubit.
To implement a heralding protocol for improved qubit initialization.
To explore a fast qubit reset method.

Main Methods:

Utilized continuous measurement in the weak excitation regime.
Implemented a heralding procedure to ensure initialization to the ground state.
Analyzed pointer state distributions for fidelity assessment.

Main Results:

Achieved single-shot readout fidelity below one part in 1000 resolution.
Boosted readout fidelity to 93.9% using the heralding protocol.
Suppressed errors caused by spurious thermal population.
Demonstrated potential for a simple, fast qubit reset protocol.

Conclusions:

High-fidelity readout and initialization are achievable with continuous measurement and heralding.
The demonstrated techniques significantly improve superconducting qubit performance.
This work contributes to the development of scalable quantum computing architectures.