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Related Experiment Video

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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

Catch-disperse-release readout for superconducting qubits.

Eyob A Sete¹, Andrei Galiautdinov, Eric Mlinar

¹Department of Electrical Engineering, University of California, Riverside, California 92521, USA. esete@ee.ucr.edu

Physical Review Letters

|June 11, 2013

Summary

We demonstrate a fast, high-fidelity readout for superconducting qubits using a tunable coupler to prevent signal loss. This method leverages quantum nonlinearity to reduce measurement errors, improving qubit performance.

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Area of Science:

Quantum Computing
Superconducting Circuits
Quantum Measurement

Background:

Superconducting qubits are a leading platform for quantum computation.
The Purcell effect, a damping mechanism, limits readout fidelity in superconducting circuits.
Fast and high-fidelity qubit readout is crucial for scalable quantum computing.

Purpose of the Study:

To develop a single-shot readout technique for superconducting qubits.
To mitigate the Purcell effect during qubit readout.
To investigate the impact of nonlinearity on readout performance and error reduction.

Main Methods:

Utilizing a tunable coupler to control resonator-transmission line coupling.
Implementing a controlled catch, dispersion, and release of a microwave field for readout.
Operating in the strongly nonlinear dispersive regime with adiabatic qubit frequency tuning.

Main Results:

Achieved fast, high-fidelity single-shot readout of superconducting qubits.
Successfully circumvented Purcell effect damping using the tunable coupler.
Observed quadrature squeezing of the resonator field below the standard quantum limit due to Jaynes-Cummings nonlinearity.
Demonstrated a significant decrease in measurement error attributed to quantum effects.

Conclusions:

Adiabatic qubit frequency tuning enables high-fidelity readout even in the nonlinear regime.
The tunable coupler effectively suppresses damping, enhancing readout speed and accuracy.
Quantum nonlinearity offers a pathway to further reduce measurement errors in superconducting qubit readout.