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arXiv · 2406.09480

A photon-interfaced ten qubit quantum network node

M. Canteri·Z. X. Koong·J. Bate·A. Winkler·V. Krutyanskiy·B. P. Lanyon
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Abstract

We entangle each individual matter-qubit in a register of ten to a separate travelling photon. The qubits are encoded in a string of cotrapped atomic ions. By switching the trap confinement, ions are brought one at a time into the waist of an optical cavity and emit a photon via a laser-driven cavity-mediated Raman transition. The result is a train of photonic-qubits, each near-maximally entangled by their polarisation with a different ion-qubit in the string. An average ion-photon Bell state fidelity of 92(1)% is achieved, for an average probability for detecting each single photon of 9.1(8)%. The technique is directly scalable to larger ion-qubit registers and opens up the near-term possibility of entangling distributed networks of trapped-ion quantum processors, sensing arrays and clocks.

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M. Canteri, Z. X. Koong, J. Bate, A. Winkler, V. Krutyanskiy, B. P. Lanyon. 2024-06-13. A photon-interfaced ten qubit quantum network node. https://arxiv.org/abs/2406.09480

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