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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

Improved superconducting qubit readout by qubit-induced nonlinearities.

Maxime Boissonneault¹, J M Gambetta, Alexandre Blais

¹Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada, J1K 2R1.

Physical Review Letters

|September 28, 2010

Summary

This summary is machine-generated.

We propose using qubit nonlinearity to enhance signal-to-noise ratio (SNR) in dispersive readout schemes. This approach leverages the qubit

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Area of Science:

Quantum computing
Quantum measurement science

Background:

Dispersive readout schemes are crucial for quantum computing.
Qubit-induced nonlinearity typically limits measurement fidelity by reducing signal-to-noise ratio (SNR).

Purpose of the Study:

To propose a novel approach to enhance SNR in dispersive readout schemes.
To investigate the use of qubit nonlinearity to improve measurement fidelity.

Main Methods:

Analytical derivation of a regime where qubit nonlinearity enhances SNR.
Theoretical analysis of multi-level qubit structures.

Main Results:

A regime exists where qubit nonlinearity can increase SNR.
This physics explains high-fidelity avalanchelike measurements.

Conclusions:

Qubit nonlinearity can be advantageously exploited in dispersive readout.
The proposed method offers a pathway to improved quantum measurement fidelity.