Quantum Networking at the Speed of Quantum Computation: Kilohertz Entanglement in a Heterogeneous Quantum System
Year: 2026
Type: preprint
Abstract: Distributed quantum computing requires rapid, high-fidelity entanglement between qubits in separate processor modules. Photonic links between single-atom qubits provide switchable, long-range connections, but photon loss limits their entanglement rate. Here we entangle a trapped $^{138}$Ba$^{+}$ ion with a silicon-vacancy (SiV$^{-}$) center in a diamond nanophotonic cavity. A photon emitted by the ion is converted in wavelength and encoding, reflected from the SiV$^{-}$--cavity system and detected, so that a single detected photon heralds entanglement. Including all conversion losses, we generate ion--SiV$^{-}$ Bell pairs at an average rate of 1.03(1) kHz with a fidelity of 87.9(7)%. This is four times the rate of the fastest photonic link between two trapped ions and corresponds to one Bell pair per millisecond, matching the cycle time of planned trapped-ion processors.
Source: arXiv (Cornell University)
Authors: Hartung, Lukas, Barral, Pierre, Glachman, Noah, Toh, George, Davidson, Jacob H., Saha, Sagnik, Chuang, Alexander, Cambria, Matthew C., Sutula, Madison, Abulnaga, Alexander, Brevoord, Julia, Chiaverini, John, Counts, Ian, Dabbagh, Aos, Dangel, Christian, Deckoff-Jones, Skylar, De-Eknamkul, Chawina, Dietz, Jonathan, Forst, Riley, Gundlapalli, Prithvi, Ha, Jeonghoon, Haas, Michael, Meulbroek, Ezekiel, Mucchietto, Andrea, Riedel, Daniel, Sachs, Jonah, Sage, Jeremy, Shalaev, Mikhail, Shi, Harriet, Sukachev, Denis, Yu, Yichao, Monroe, Christopher, Mondrik, Nicholas, Bhaskar, Mihir, Machielse, Bart, Pompili, Matteo, Robens, Carsten, Levonian, David
Institutions: IonQ (United States), Duke University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7221124638