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Demonstration of a Timescale Based on a Stable Optical Carrier.

08:00 EDT 25th October 2019 | BioPortfolio

Summary of "Demonstration of a Timescale Based on a Stable Optical Carrier."

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 ^{87}Sr 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 1×10^{-17} after a few months of averaging, making timekeeping at the 10^{-18} level a realistic prospect.

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This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 173201

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