aiqbench takeQuantum Computing

This research presents a significant advancement in quantum computing by achieving high-fidelity inter-species entangling gates between rubidium and cesium atoms, enabling robust multi-atom error syndrome measurements. These capabilities are critical for implementing the quantum non-demolition (QND) protocols required to build scalable fault-tolerant quantum processors. The work directly addresses a key bottleneck in maintaining qubit coherence during active error correction cycles within neutral atom architectures.

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

arXivAugust 3, 20261 min read

arXiv:2603.13492v4 Announce Type: replace Abstract: 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.

Authors: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

Abstract: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.

arXiv:2603.13492 [quant-ph]

(or arXiv:2603.13492v4 [quant-ph] for this version)

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