A Cavity-Interfaced Register of Trapped-Ion Qubits with Multi-Second Coherence
Abstract
Scalable quantum networks require generating remote entanglement faster than decoherence erases it, calling for nodes that combine efficient light-matter interfaces with long coherence times. Cavity-coupled trapped ions are a promising platform for network nodes, offering high-efficiency extraction of photons. Here, we report multi-second coherence for a qubit register in a cavity-integrated ion trap. First, using dynamical decoupling on spin ground states, the coherence times of five co-trapped ion qubits are extended into the multi-second regime. Second, cavity-collected ion-photon entanglement is faithfully stored in these protected ion-memory states for multiple seconds. Third, we show that ion-memory qubits can be robust to the generation of over a thousand cavity photons by a co-trapped ion, with decoherence limited by laser crosstalk. Finally, we estimate that a modestly improved and duplicated ion-cavity system could enable the simultaneous establishment of multiple remote Bell pairs between two remote ion registers, representing a step toward networking multi-qubit prototype trapped-ion quantum processors.
Related
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BibTeX
@misc{bate2026cavityinterfaced,
title = {{A Cavity-Interfaced Register of Trapped-Ion Qubits with Multi-Second Coherence}},
author = {James Bate and Johannes Helgert and Marco Canteri and Victor Krutyanskiy and Benjamin Peter Lanyon},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2608.22030},
eprint = {2608.22030},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.22030},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - A Cavity-Interfaced Register of Trapped-Ion Qubits with Multi-Second Coherence
AU - James Bate
AU - Johannes Helgert
AU - Marco Canteri
AU - Victor Krutyanskiy
AU - Benjamin Peter Lanyon
PY - 2026
DA - 2026/09/13
PB - arXiv
DO - 10.48550/arxiv.2608.22030
UR - https://arxiv.org/abs/2608.22030
AB - Scalable quantum networks require generating remote entanglement faster than decoherence erases it, calling for nodes that combine efficient light-matter interfaces with long coherence times. Cavity-coupled trapped ions are a promising platform for network nodes, offering high-efficiency extraction of photons. Here, we report multi-second coherence for a qubit register in a cavity-integrated ion trap. First, using dynamical decoupling on spin ground states, the coherence times of five co-trapped ion qubits are extended into the multi-second regime. Second, cavity-collected ion-photon entanglement is faithfully stored in these protected ion-memory states for multiple seconds. Third, we show that ion-memory qubits can be robust to the generation of over a thousand cavity photons by a co-trapped ion, with decoherence limited by laser crosstalk. Finally, we estimate that a modestly improved and duplicated ion-cavity system could enable the simultaneous establishment of multiple remote Bell pairs between two remote ion registers, representing a step toward networking multi-qubit prototype trapped-ion quantum processors.
ER -