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arXiv:1703.02651 · Physical Review X

High-Fidelity Single-Shot Readout for a Spin Qubit via an Enhanced Latching Mechanism

Patrick Harvey-Collard, Benjamin D’Anjou, Martin Rudolph, N. Tobias Jacobson, Jason Dominguez, Gregory A. Ten Eyck, Joel R. Wendt, Tammy Pluym, Michael P. Lilly, W. A. Coish, Michel Pioro-Ladrière, Malcolm S. Carroll

Published May 21, 2018• 78 citations
arXivHTMLPDF

Abstract

A new approach to reading spin-based qubits achieves readout fidelities higher than 99.86%, the lowest error rate to date. The technique combines speed and accuracy and could be used in many types of spin-based quantum computers.
DOI
10.1103/physrevx.8.021046

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Reading a qubit is a fundamental operation in quantum computing. It translates quantum information into classical information enabling subsequent classification to assign the qubit states '0' or '1'. Unfortunately, qubit readout is one of the most error-prone and slowest operations on a superconducting quantum processor. On state-of-the-art superconducting quantum processors, readout errors can range from 1--10%. These errors occur for various reasons - crosstalk, spontaneous state transitions, and excitation caused by the readout pulse. The error-prone nature of readout has resulted in significant research to design better discriminators to achieve higher qubit-readout accuracies. High readout accuracy is essential for enabling high fidelity for near-term noisy quantum computers and error-corrected quantum computers of the future.