Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Atom and Ion Qubits (joint session QI/Q)
Q 15.5: Vortrag
Montag, 10. März 2025, 18:15–18:30, HS II
Distributed quantum computing between two trapped-ion processors — Dougal Main, Peter Drmota, •David P. Nadlinger, Ellis M. Ainley, Ayush Agrawal, Bethan C. Nichol, Raghavendra Srinivas, Gabriel Araneda, and David M. Lucas — Dept. of Physics, University of Oxford, Oxford, U.K.
Modular, hybrid quantum systems, where matter qubits are linked via photonic interconnects, hold vast potential across a wide gamut of applications including quantum communication, large-scale computing, and quantum-enhanced metrology. In this talk, I describe an elementary two-node quantum network where 88Sr+ acts as the optical interface to generate remote Bell pairs with state-of-the-art performance (fidelities of ∼ 97.0% at rates 100 s−1). By co-trapping 43Ca+ ions, which provide a long-lived memory undisturbed by any network activity (remote Bell state coherence times >10 s), we demonstrate the first distributed quantum computation across two optically linked quantum processors using deterministic, repeatable quantum gate teleportation [1]. To illustrate the postselection-free execution of consecutive remote two-qubit gates, we benchmark distributed iSWAP- and SWAP-class circuits along with two-qubit instances of Grover’s search algorithm. Finally, we examine how emitter motion impacts atom–photon entanglement generation through phase uncertainty, recoil, and coupling efficiency, proposing an intuitive framework applicable to both conventional optics and waveguide-based systems.
[1] D. Main et al., "Distributed Quantum Computing across an Optical Network Link", Nature (accepted, arXiv:2407.00835)
Keywords: distributed quantum computing; hybrid quantum systems; matter-light interfaces; spontaneous emission; quantum optics