A Cavity-Interfaced Register of Trapped-Ion Qubits with Multi-Second Coherence

• URL: http://arxiv.org/abs/2608.22030v1
• Date: Sat, 22 Aug 2026 16:17:03 GMT
• Title: A Cavity-Interfaced Register of Trapped-Ion Qubits with Multi-Second Coherence
• Abstract summary: We report multi-second coherence for a qubit register in a cavity-integrated ion trap.<n>Ion-memory qubits can be robust to the generation over a thousand cavity photons by a co-trapped ion.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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 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.

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