Year: 2023
Type: article
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.
Source: Physical Review Letters
Institutions: Austrian Academy of Sciences, Universität Innsbruck, Institute for Quantum Optics and Quantum Information Innsbruck, Georgetown University, University of Geneva, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, CEA Paris-Saclay, Institut de Physique Théorique
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
Awards: QuantNet: Spins in Diamond for a Quantum Network, G2581295576, G4124011123, G434337789, G4713038487, G5259331294, G5610834244, Engineering Reservoirs and Optimizing Response Function Measurements in Quantum Simulators and Computers, G7203734123, Quantum Frequency Conversion for Ion-Trap Quantum Networks, Quantum Internet Alliance
OpenAlex ID: W4294320751