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; 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

doi:10.1103/pvjm-jxd2

Qubit Syndrome Measurements with a High-Fidelity Rb-Cs Rydberg Gate

J. Miles ¹, M. T. Lichtman ¹, A. M. Scott¹, J. Scott ¹, S. A. Norrell ², M. J. Bedalov ¹, D. A. Belknap ¹, D. C. Cole ³, S. Y. Eubanks ³ et al.

M. Gillette ¹, P. Gokhale⁴, J. Goldwin ¹, M. Iliev ³, R. A. Jones³, K. W. Kuper ³, D. Mason³, P. T. Mitchell ³, J. D. Murphree ¹, N. A. Neff-Mallon ¹, T. W. Noel ³, A. G. Radnaev ³, I. V. Vinogradov ³, and M. Saffman ^1,2

¹Infleqtion, Madison, Wisconsin, 53703, USA
²Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA
³Infleqtion, Boulder, Colorado, 80301, USA
⁴Infleqtion, Chicago, Illinois, 60615, USA

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Phys. Rev. Lett. 137, 100601 – Published 2 September, 2026

DOI: https://doi.org/10.1103/pvjm-jxd2

Abstract

We demonstrate an interspecies entangling Rydberg gate between rubidium (Rb) and cesium (Cs) atoms with fidelity $F = 0.975 \pm 0.002$ . The two-species atom array enables in-place quantum nondemolition (QND) qubit measurements which are a key capability for quantum error correction. We demonstrate this functionality with multiatom error syndrome measurements achieving QND measurement fidelities of $F_{QND} = 0.933 (12)$ and 0.865(17) for two- and three-qubit plaquettes, respectively.

Physical Review Letters

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Qubit Syndrome Measurements with a High-Fidelity Rb-Cs Rydberg Gate

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Qubit Syndrome Measurements with a High-Fidelity Rb-Cs Rydberg Gate

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