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• W4381489438 abstract "The combination of optical time transfer and optical clocks opens up the possibility of large-scale free-space networks that connect both ground-based optical clocks and future space-based optical clocks. Such networks promise better tests of general relativity1-3, dark-matter searches4 and gravitational-wave detection5. The ability to connect optical clocks to a distant satellite could enable space-based very long baseline interferometry6,7, advanced satellite navigation8, clock-based geodesy2,9,10 and thousandfold improvements in intercontinental time dissemination11,12. Thus far, only optical clocks have pushed towards quantum-limited performance13. By contrast, optical time transfer has not operated at the analogous quantum limit set by the number of received photons. Here we demonstrate time transfer with near quantum-limited acquisition and timing at 10,000 times lower received power than previous approaches14-24. Over 300 km between mountaintops in Hawaii with launched powers as low as 40 µW, distant sites are synchronized to 320 attoseconds. This nearly quantum-limited operation is critical for long-distance free-space links in which photons are few and amplification costly: at 4.0 mW transmit power, this approach can support 102 dB link loss, more than sufficient for future time transfer to geosynchronous orbits." @default.
• W4381489438 created "2023-06-22" @default.
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• W4381489438 date "2023-06-21" @default.
• W4381489438 modified "2023-10-12" @default.
• W4381489438 title "Quantum-limited optical time transfer for future geosynchronous links" @default.
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• W4381489438 doi "https://doi.org/10.1038/s41586-023-06032-5" @default.
• W4381489438 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37344648" @default.
• W4381489438 hasPublicationYear "2023" @default.
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