@article{13600, author = {Lingfeng Yan and Stefan Lannig and William Milner and Max Frankel and Ben Lewis and Dahyeon Lee and Kyungtae Kim and Jun Ye}, title = {High-Power Clock Laser Spectrally Tailored for High-Fidelity Quantum State Engineering}, abstract = {

Highly frequency-stable lasers are ubiquitous tools 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 4W and minimized frequency noise up to a few kHz Fourier frequency, together with long-term instability of 3.5x10^{-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 F*2 = 0.99964(3) when simultaneously driving 3000 optical qubits with a homogeneous Rabi frequency ranging from 10 Hz to 1 kHz. This result represents the highest single optical-qubit-gate fidelity for a large number of atoms.

}, year = {2025}, journal = {Phys. Rev. X}, volume = {15}, pages = {031055}, month = {2025-08}, publisher = {American Physical Society}, url = {https://link.aps.org/doi/10.1103/qw53-8b8r}, doi = {10.1103/qw53-8b8r}, }