2025/01/16 by Yan, Lingfeng, Lannig, Stefan, Milner, William R. +5 · 5 citations
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences
paper · doi:10.48550/arxiv.2501.09343
Highly frequency-stable lasers are a ubiquitous tool for optical frequency metrology, precision interferometry, and quantum information science. While making a universally applicable laser is unrealistic, spectral noise can be tailored for specific applications. Here we report a high-power 698 nm clock laser with a maximum output of \SI4W and minimized frequency noise up to a few kHz Fourier frequency, together with long-term instability of 3.5 × 10-17 at one to thousands of seconds. The laser frequency noise is precisely characterized with atom-based spectral analysis that employs a pulse sequence designed to suppress sensitivity to intensity noise. This method provides universally applicable tunability of the spectral response and analysis of quantum sensors over a wide frequency range. With the optimized laser system characterized by this technique, we achieve an average single-qubit Clifford gate fidelity of up to F12 = 0.99964(3) when simultaneously driving 3000 optical qubits with a homogeneous Rabi frequency ranging from \SI10Hz to ∼\SI1kHz. This result represents the highest single optical-qubit gate fidelity for large number of atoms.