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physics.optics2026
Yb/Sr optical clock comparison at 2.2E-18 uncertainty over a 1350-km fiber link
Lei Hou, Xiang-Pei Liu, Zhuan-Xian Xiong +32
Redefining the International system of Units (SI) second requires independent frequency-ratio measurements between clocks based on different laboratories, with an overall uncertain…
quant-ph2026★ 1 cited
High-Performance Quantum Frequency Conversion from Ultraviolet to Telecom Band
Yi Yang, Bin Wang, Ji-Chao Lin +10
Quantum frequency conversion (QFC) is essential for bridging the spectral gap between stationary qubits and low-loss optical communication channels. In this work, we demonstrate a…