Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 37: Poster III
Q 37.12: Poster
Wednesday, March 13, 2024, 17:00–19:00, Tent B
Suppression of Servo-Phase Noise for High-Fidelity Rydberg Excitations — Philipp Herbig1, Ben Michaelis1, Nejira Pintul1, Tobias Petersen1, Jonas Rauchfuß1, Oscar Murzewitz1, Clara Schellong1, Jan Deppe1, Till Schacht1, Alexander Ilin1, •Koen Sponselee1, Klaus Sengstock1,2, and Christoph Becker1,2 — 1Center for Optical Quantum Technologies, Hamburg, Germany — 2Institute for Quantum Physics, Hamburg, Germany
Neutral-atom quantum computers require highly-stable lasers for resonant excitation, which is usually achieved with a Pound-Drever-Hall (PDH) locking scheme. However, this feedback scheme creates servo bumps, which can severely limit excitation fidelities if the servo bandwidth frequency is similar to the Rabi frequency. A feed-forward scheme by Li et al. [1] supresses these servo bumps, and is here implemented in our Ytterbium quantum-computing experiment.
We are setting up our experiment to trap neutral 171-Ytterbium atoms in optical tweezers, providing several options for qubits. A 301.5 nm laser can then be used to excite 3P0 state atoms to an (n>50) 3S1 Rydberg state, entangling two neighbouring qubits with expected Rabi frequencies on the order of MHz. The fundamental of this laser is first stabilised to a cavity with a PDH lock. The servo bumps, about 500 kHz away from the carrier, are supressed by more than 20 dB using this scheme [1]. Simulations indicate that this method leads to significantly better excitation fidelities.
[1] Li et al., PRA 18, 064005 (2022)
Keywords: Quantum computing; Rydberg; Ytterbium; High fidelity; Quantum computer