Qubit syndrome measurements with a high fidelity Rb-Cs Rydberg gate

Quantum Physics [Submitted on 13 Mar 2026] Qubit syndrome measurements with a high fidelity Rb-Cs Rydberg gate J. Miles, M. T. Lichtman, A. M. Scott, J. Scott, S. A. Norrell, M. J. Bedalov, D. A. Belknap, D. C. Cole, S. Y. Eubanks, M. Gillette, P. Gokhale, J. Goldwin, G. T. Hickman, M. Iliev, R. A. Jones, K. W. Kuper, D. Mason, P. T. Mitchell, J. D. Murphree, N. A. Neff-Mallon, T. W. Noel, A. G. Radnaev, I. V. Vinogradov, M. Saffman We demonstrate an inter-species entangling Rydberg gate between rubidium (Rb) and cesium (Cs) atoms with fidelity \mathcal F = 0.975\pm 0.002. The two-species atom array enables in-place quantum non-demolition (QND) qubit measurements which are a key capability for quantum error correction. We demonstrate this functionality with multi-atom error syndrome measurements achieving QND measurement fidelities of {\mathcal F}_{\rm QND} = 0.933(12) and 0.865(17) for two- and three-qubit plaquettes, respectively. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.13492 [quant-ph]   (or arXiv:2603.13492v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.13492 Focus to learn more Submission history From: Mark Saffman [view email] [v1] Fri, 13 Mar 2026 18:09:57 UTC (2,106 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation 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 Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)