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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.47: Poster

Donnerstag, 11. September 2025, 16:30–18:30, ZHG Foyer 1. OG

Impact of electrode noise on the qubit coherence time in a 2D ion trap — •Daniel Busch, Benjamin Bürger, Patrick Huber, Dorna Niroomand, and Christof Wunderlich — Department of Physics, School of Science and Technology, University of Siegen, 57068 Siegen, Germany

An obstacle to achieve long qubit coherence times for quantum computing are uncontrolled parameter fluctuations (noise). Its elimination and mitigation to the point that fault-tolerance can be achieved constitutes one of the main challenges on the path to scalability. In the specific case of trapped-ion quantum computers, ion traps with segmented electrode are one approach to scale up the number of qubits. However, electric field fluctuations at DC electrodes introduce yet another source of noise. We set up a cryogenic quantum demonstrator that includes a cryogenic digital-to-analog converter (DAC) combined with a switching matrix to handle this issue. Here, we present first results of evaluating proof-of-principle optical switches in a room temperature experiment using a 2D segmented ion trap that includes built-in micromagnets. We report on coherence times measured in Ramsey experiments and discuss potential remaining electric noise originating from the electrodes.

Keywords: Quantum computing; Trapped ions; Coherence Time; Noise