Abstract
We report on an elementary quantum network of two atomic ions separated by 230 m. The ions are trapped in different buildings and connected with 520(2) m of optical fiber. At each network node, the electronic state of an ion is entangled with the polarization state of a single cavity photon; subsequent to interference of the photons at a beam splitter, photon detection heralds entanglement between the two ions. Fidelities of up to are achieved with respect to a maximally entangled Bell state, with a success probability of . We analyze the routes to improve these metrics, paving the way for long-distance networks of entangled quantum processors.
- Received 3 September 2022
- Accepted 20 December 2022
DOI:https://doi.org/10.1103/PhysRevLett.130.050803
© 2023 American Physical Society
Physics Subject Headings (PhySH)
synopsis
Trapped Ions Go the Distance
Published 2 February 2023
Researchers have achieved long-distance entanglement between two calcium ions, each of which lies in a different building, showing that trapped ions could be used to create quantum networks.
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