Maximizing the Nondemolition Nature of a Quantum Measurement Via an Adaptive Readout Protocol

Arjen Vaartjes; Rocky Yue Su; Laura A O’Neill; Paul Steinacker; Gauri Goenka; Mark R van Blankenstein; Xi Yu; Benjamin Wilhelm; Alexander M Jakob; Fay E Hudson; Kohei M Itoh; Chih Hwan Yang; Andrew S Dzurak; David N Jamieson; Martin Nurizzo; Danielle Holmes; Arne Laucht; Andrea Morello

Journal article

Maximizing the Nondemolition Nature of a Quantum Measurement Via an Adaptive Readout Protocol

Arjen Vaartjes, Rocky Yue Su, Laura A O’Neill, Paul Steinacker, Gauri Goenka, Mark R van Blankenstein, Xi Yu, Benjamin Wilhelm, Alexander M Jakob, Fay E Hudson, Kohei M Itoh, Chih Hwan Yang, Andrew S Dzurak, David N Jamieson, Martin Nurizzo, Danielle Holmes, Arne Laucht, Andrea Morello

PRX Quantum | American Physical Society (APS) | Published : 2026

DOI: 10.1103/jtn1-wzyl

Open access

Abstract

Quantum error correction benefits from high-fidelity, noninvasive measurements for fault-tolerant quantum computing. Deviations from ideal quantum nondemolition (QND) measurements can disturb the encoded information. To address this challenge, we develop a readout protocol for a D -dimensional system that, after a single positive outcome, switches to probing only the D − 1 remaining subspace. This adaptive switching strategy minimizes measurement-induced errors by relying on negative..

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