Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 4: Quantum Computing and Simulation I

Q 4.5: Talk

Monday, March 2, 2026, 12:45–13:00, P 10

Experimental characterization of all-to-all-coupled trapped-ion quantum registers — •Markus Nünnerich, Patrick H. Huber, Dorna Niroomand, and Christof Wunderlich — Dept. of Physics, School of Science and Technology, University of Siegen, 57068 Siegen, Germany

For quantum computing and -simulation, high connectivity between qubits mediated by long-range interactions can be beneficial to speed up running times of algorithms and to enable efficient error correction. Here, we experimentally characterize computational quantum registers of varying size with all-to-all interaction between qubits. The qubits are encoded into hyperfine states of laser-cooled trapped ¹⁷¹Yb⁺ ions. The ions interact via magnetic gradient induced coupling (MAGIC) and all coherent operations on qubits are performed using RF radiation. We carry out measurements on individual addressing of interacting qubits within a computational register (crosstalk), qubit read-out, and the all-to-all interaction between qubits. Furthermore, we entangle subsets of the qubit register using bare-state qubits or dressed-state qubits. In addition, we describe how fluctuations of the trapping potential affect the interaction between qubits.

Keywords: All-to-All coupling; Entangling gates; Crosstalk; Trapped ions