Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 66: Poster – Quantum Technologies III
Q 66.24: Poster
Donnerstag, 5. März 2026, 17:00–19:00, Philo 2. OG
Towards sympathetically cooled qubits in a 30-qubit X-junction chip — •Kevin Rempel1, Vanessa Wienzek1, Markus Duwe1,2, Sascha Agne2, Celeste Torkzaban1, and Christian Ospelkaus1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Featuring high fidelities, long coherence times and all-to-all interconnectivity of qubits, surface-electrode ion traps represent a promising physical platform for realizing a universal quantum processor for quantum computing and simulation. In our experiment, we encode qubits using a hyperfine transition in 9Be+ ions that is magnetic-field insensitive to first order. The internal and motional states are manipulated by trap-integrated microwave conductors.
We will upgrade our experiment with a cryogenic X-junction-style trap chip which will allow us to handle up to 30 qubits. It includes independent storage, detection and gate zones. To improve gate fidelities and extend the number of gates we can run before directly re-cooling the qubits, we are preparing to use 40Ca+ ions to sympathetically cool our 9Be+ qubits by coupling specific motional modes of the ion crystal. This can be achieved by resonantly tuning the third-order Coulomb interaction or by applying oscillating electric potential modulations to the existing confining trap potential. We will report on our simulation results and the necessary hardware modifications.
Keywords: cryogenic; microwave-based gates; surface electrode ion trap; sympathetic cooling