期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.173201
关键词
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资金
- National Institute of Standards and Technology, Defense Advanced Research Projects Agency
- Air Force Office for Scientific Research, National Science Foundation (NSF) [PHY-1734006]
- Cluster of Excellence [EXC 2132]
- European Commission's H2020 Marie Sklodowska-Curie Actions Research and Innovation Staff Exchange (MSCA RISE) [69115]
- National Research Council postdoctoral fellowship
- Physikalisch-Technische Bundesanstalt
We report on the first timescale based entirely on optical technology. Existing timescales, including those incorporating optical frequency standards, rely exclusively on microwave local oscillators owing to the lack of an optical oscillator with the required frequency predictability and stability for reliable steering. We combine a cryogenic silicon cavity exhibiting improved long-term stability and an accurate Sr-87 lattice clock to form a timescale that outperforms them all. Our timescale accumulates an estimated time error of only 48 +/- 94 ps over 34 days of operation. Our analysis indicates that this timescale is capable of reaching a stability below 1 x 10(-17) after a few months of averaging, making timekeeping at the 10(-18) level a realistic prospect.
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