Oxford Achieves About 10 Seconds of Remote Ion Entanglement Storage
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On October 21, 2026, Phys.org reported that researchers at the University of Oxford maintained entanglement with remote memory qubits for about 10 seconds in a two-node ion quantum network connected by optical fiber. Each node contains one strontium ion and one calcium ion: photons emitted by the strontium ion establish remote entanglement through a Bell-state measurement, after which in-node operations extend the entanglement to the calcium ion, forming three-ion or four-ion entangled states across the nodes. This is the latest report on the event so far, with no subsequent developments yet.
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- Phys.org Optics & PhotonicsPicksOxford University Uses Atomic Memory to Keep Distant Ions Entangled for About 10 Seconds
Researchers at the University of Oxford have kept remote memory qubits entangled for about 10 seconds in a two-node ion quantum network connected by optical fiber. Each node contains one strontium ion and one calcium ion. Photons emitted by the strontium ions establish remote entanglement through Bell-state measurement, and local operations then extend the entanglement to the calcium ions, creating three- or four-ion entangled states across the nodes.
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