Progress on optical- clock-based time scale at NIST: Simulations and preliminary real-data analysis

Jian Yao; Jeffrey Sherman; Tara Fortier; Holly Leopardi; Thomas Parker; Judah Levine; Joshua Savory; Stefania Romisch; William McGrew; Xiaogang Zhang; Daniele Nicolodi; Robert Fasano; Stefan Alaric Schäffer; Kyle Beloy; Andrew Ludlow

doi:10.1002/navi.248

Progress on optical- clock-based time scale at NIST: Simulations and preliminary real-data analysis

Jian Yao, Jeffrey Sherman, Tara Fortier, Holly Leopardi, Thomas Parker, Judah Levine, Joshua Savory, Stefania Romisch, William McGrew, Xiaogang Zhang, Daniele Nicolodi, Robert Fasano, Stefan Alaric Schäffer, Kyle Beloy, Andrew Ludlow

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4 Citationer (Scopus)

Abstract

This paper describes the recent National Institute of Standards and Technology (NIST) work on incorporating an optical clock into a time scale. We simulate a time scale composed of continuously operating commercial hydrogen masers and an optical frequency standard that does not operate continuously as a clock. The simulations indicate that to achieve the same performance of a continuously operating Cs-fountain time scale, it is necessary to run an optical frequency standard 12 minutes per half a day, or 1 hour per day, or 4 hours per 2.33 day, or 12 hours per week. Following the simulations, a Yb optical clock at NIST was frequently operated during the periods of 2017 March – April and 2017 late October – late December. During this operation, comb-mediated measurements between the Yb clock and a hydrogen maser had durations ranging from a few minutes to a few hours, depending on the experimental arrangements. This paper analyzes these real data preliminarily and discusses the results. More data are needed to make a more complete assessment.

Originalsprog	Engelsk
Tidsskrift	Navigation
Vol/bind	248
Sider (fra-til)	1-8
ISSN	0028-1522
DOI	https://doi.org/10.1002/navi.248
Status	Udgivet - 1 dec. 2018

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10.1002/navi.248

Yao_et_al-2018-NavigationForlagets udgivne version, 1,3 MB

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abstract = "This paper describes the recent National Institute of Standards and Technology (NIST) work on incorporating an optical clock into a time scale. We simulate a time scale composed of continuously operating commercial hydrogen masers and an optical frequency standard that does not operate continuously as a clock. The simulations indicate that to achieve the same performance of a continuously operating Cs-fountain time scale, it is necessary to run an optical frequency standard 12 minutes per half a day, or 1 hour per day, or 4 hours per 2.33 day, or 12 hours per week. Following the simulations, a Yb optical clock at NIST was frequently operated during the periods of 2017 March – April and 2017 late October – late December. During this operation, comb-mediated measurements between the Yb clock and a hydrogen maser had durations ranging from a few minutes to a few hours, depending on the experimental arrangements. This paper analyzes these real data preliminarily and discusses the results. More data are needed to make a more complete assessment.",

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AU - Yao, Jian

AU - Sherman, Jeffrey

AU - Fortier, Tara

AU - Leopardi, Holly

AU - Parker, Thomas

AU - Levine, Judah

AU - Savory, Joshua

AU - Romisch, Stefania

AU - McGrew, William

AU - Zhang, Xiaogang

AU - Nicolodi, Daniele

AU - Fasano, Robert

AU - Schäffer, Stefan Alaric

AU - Beloy, Kyle

AU - Ludlow, Andrew

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N2 - This paper describes the recent National Institute of Standards and Technology (NIST) work on incorporating an optical clock into a time scale. We simulate a time scale composed of continuously operating commercial hydrogen masers and an optical frequency standard that does not operate continuously as a clock. The simulations indicate that to achieve the same performance of a continuously operating Cs-fountain time scale, it is necessary to run an optical frequency standard 12 minutes per half a day, or 1 hour per day, or 4 hours per 2.33 day, or 12 hours per week. Following the simulations, a Yb optical clock at NIST was frequently operated during the periods of 2017 March – April and 2017 late October – late December. During this operation, comb-mediated measurements between the Yb clock and a hydrogen maser had durations ranging from a few minutes to a few hours, depending on the experimental arrangements. This paper analyzes these real data preliminarily and discusses the results. More data are needed to make a more complete assessment.

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Progress on optical- clock-based time scale at NIST: Simulations and preliminary real-data analysis

Abstract

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