Maximizing the nondemolition nature of a quantum measurement via an adaptive readout protocol

Quantum Physics arXiv:2511.10978 (quant-ph) [Submitted on 14 Nov 2025] Title:Maximizing the nondemolition nature of a quantum measurement via an adaptive readout protocol Authors: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 View a PDF of the paper titled Maximizing the nondemolition nature of a quantum measurement via an adaptive readout protocol, by Arjen Vaartjes and 17 other authors View PDF HTML (experimental) Abstract:Quantum error correction (QEC) requires non-invasive measurements for fault tolerant quantum computing. Deviations from ideal quantum non-demolition (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-result measurement results that do not perturb the Hamiltonian. We apply the protocol on an 8-dimensional $^{123}{\rm Sb}$ nuclear qudit in silicon, and achieve an increase in the readout fidelity from $(98.93\pm0.07)\%$ to $(99.61\pm0.04)\%$, while reducing threefold the overall readout time. To highlight the broader relevance of measurement-induced errors, we study a 10-dimensional $^{73}{\rm Ge}$ nuclear spin read out through Pauli spin blockade, revealing nuclear spin flips arising from hyperfine and quadrupole interactions. These results unveil the effect of non-ideal QND readout across diverse platforms, and introduce an efficient readout protocol that can be implemented with minimal FPGA logic on existing hardware. Comments: Subjects: Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:2511.10978 [quant-ph] (or arXiv:2511.10978v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2511.10978 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Arjen Vaartjes [view email] [v1] Fri, 14 Nov 2025 05:52:54 UTC (18,146 KB) Full-text links: Access Paper: View a PDF of the paper titled Maximizing the nondemolition nature of a quantum measurement via an adaptive readout protocol, by Arjen Vaartjes and 17 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2025-11 Change to browse by: cond-mat cond-mat.mes-hall References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) Links to Code Toggle Papers with Code (What is Papers with Code?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)