Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantum Computing and Simulation I
Q 60.6: Vortrag
Freitag, 15. März 2024, 12:15–12:30, Aula
Fast, robust and laser-free universal entangling gates for trapped-ion quantum computing — •Markus Nünnerich1, Patrick Barthel1, Patrick Huber1, Dorna Niroomand1, Christof Wunderlich1, Daniel Cohen2, and Alex Retzker2 — 1Department of Physics, School of Science and Technology, University of Siegen, 57068 Siegen, Germany — 2Racah Institute of Physics, Hebrew University of Jerusalem, 91904 Jerusalem, Israel
Entangling gates are an essential building block of any quantum processor, ideally working at high speeds in a in a robust and scalable manner. We introduce and experimentally realize a novel Mølmer- Sørensen-type entangling gate. We implement double-dressing of qubit states [1], thus protecting their coherence and simultaneously inducing the gate interaction. Only a single modulated RF driving field per ion is used. The gate is implemented with trapped 171Yb+-ions in a static magnetic gradient of 19 T/m. We generate symmetric and antisymmetric Bell states in 300 us with fidelities better than 97 %. This is an order-of-magnitude improvement in gate time compared to previous entangling gates using the same small magnetic gradient. [2, 3]. In higher magnetic field gradients, already available, this entangling gate speed can be further improved.
[1] D. Farfurnik et al, Phys. Rev. A, 96, 013850 (2017) [2] Ch. Piltz et al, Sci. Adv.2, e1600093 (2016) [3] P. Barthel et al, New J. Phys., 25, 063023 (2023)
Keywords: Entangling gate; Trapped ions; Microwave; Magnetic gradient