Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 37: Poster III
Q 37.15: Poster
Wednesday, March 13, 2024, 17:00–19:00, Tent B
Microwave near-field and stimulated-Raman quantum control of 9Be+ ions in a cryogenic surface-electrode trap — •Emma Vandrey1, Sebastian Halama1, and Christian Ospelkaus1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38166 Braunschweig, Germany
Trapped-ion qubits are a promising hardware platform for quantum computing and quantum simulation. In our group, we employ surface-electrode Paul traps to confine 9Be+ ions and encode the qubits in two hyperfine levels of these ions. For motional ground-state cooling and quantum logic gates, the ability to drive sideband and carrier transitions with frequencies in the microwave regime is required. Integrating microwave conductors into the surface-electrode trap allows the ion’s internal and motional states to be controlled using oscillating magnetic fields and an oscillating magnetic gradient.
Alternatively, we can apply stimulated-Raman laser pulses to drive transitions at microwave frequencies. The laser light for this setup is generated via sum-frequency generation and subsequent second harmonic generation. Variable frequency control is implemented using a double-pass acousto-optic modulator setup with a geometry that is inherently stable with respect to thermal effects.
Both of these approaches were implemented in the context of a cryogenic ion trap apparatus. We will report on the status of the project and on a new generation of segmented multi-ion trap chips to be implemented in this environment.
Keywords: Quantum Computing; Trapped Ions; Raman laser system; Cryogenic; Microwave-based gates