Experimental demonstration shows record fractional frequency instability across a 2,067-km fiber link, indicating progress toward large-scale optical clock networks.
A research team demonstrated a 2067-km field-deployed optical frequency dissemination link over standard telecommunications fiber. The system achieved a record fractional frequency instability of 2.9 × 10⁻ 21 at one day averaging time, and maintained continuous phase lock for more than four days, marking a major step toward large-scale optical clock networks and future precision timing infrastructure.
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Chen et al. (2026) studied this question.
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