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QI: Fachverband Quanteninformation
QI 41: Quantum Computing and Simulation II (joint session Q/QI)
QI 41.4: Vortrag
Freitag, 14. März 2025, 12:00–12:15, AP-HS
Coherent control of trapped-ion qubits and qumodes via phase-stable optical addressing — •Kai Shinbrough1, Donovan J. Webb1, Iver R. Øvergaard1, Oana Băzăvan1, Sebastian Saner1, Gabriel Araneda1, Raghavendra Srinivas1,2, and Christopher J. Ballance1,2 — 1University of Oxford, Oxford, UK — 2Oxford Ionics, Oxford, UK
Control over the phase of optical addressing beams in the trapped-ion platform allows for precise control of the coupling between spin and motional states of the ion. This control serves as a resource for fast, high-fidelity multi-qubit entangling gates, as well as for continuous variable quantum information processing using the motional state qumodes of single ions and ion chains. Here we report on a suite of qubit-qubit, qubit-qumode, and qumode-qumode interactions enabled by this phase control, including two-qubit gates faster than the speed limit imposed by off-resonant carrier coupling [1], non-Gaussian operations performed on the ion motional state [2,3] (which, along with a complete set of Gaussian operations, satisfy the Lloyd-Braunstein criterion for universal quantum computation [4]), and progress toward a linear chain of 40Ca+ ions with individually addressed standing waves.
[1] S. Saner, O. Băzăvan, et al., Phys. Rev. Lett. 131, 220601 (2023).
[2] O. Băzăvan, S. Saner, et al., arXiv:2403.05471 (2024).
[3] S. Saner, O. Băzăvan, et al., arXiv:2409.03482 (2024).
[4] S. Lloyd, S. L. Braunstein, Phys. Rev. Lett. 82, 1784 (1999).
Keywords: trapped-ion; light-matter interaction; spin-boson