articlePhysical Review LettersFeb 2, 2023GREEN OA

Entanglement of Trapped-Ion Qubits Separated by 230 Meters

VKV. KrutyanskiyMGMaria GalliVKVojtech KrcmarskySBSimon BaierDFDario Fioretto

Austrian Academy of Sciences · Universität Innsbruck · +8 more institutions

PubMed
Indexed inarxivcrossrefpubmed

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 (88.0+2.2-4.7)% are achieved with respect to a maximally entangled Bell state, with a success probability of 4×10^{-5}. We analyze the routes to improve these metrics, paving the way for long-distance networks of entangled quantum processors.

Citation impact

199
total citations
FWCI
32.31
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100%
References
77
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Authors

16

Topics & keywords

Topics
Keywords
  • Quantum entanglement
  • Qubit
  • Physics
  • Beam splitter
  • Photon
  • W state
  • Quantum network
  • Ion
UN Sustainable Development Goals
  • Sustainable cities and communities
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