A clock directly linking time to a particle's mass

Shau Yu Lan, Pei Chen Kuan, Brian Estey, Damon English, Justin M. Brown, Michael A. Hohensee, Holger Müller

研究成果: Article同行評審

83 引文 斯高帕斯(Scopus)

摘要

Historically, time measurements have been based on oscillation frequencies in systems of particles, from the motion of celestial bodies to atomic transitions. Relativity and quantum mechanics show that even a single particle of mass m determines a Compton frequency ω0 = mc 2/ℏ, where c is the speed of light and ℏ is Planck's constant h divided by 2π. A clock referenced to ω0 would enable high-precision mass measurements and a fundamental definition of the second. We demonstrate such a clock using an optical frequency comb to self-reference a Ramsey-Bordé atom interferometer and synchronize an oscillator at a subharmonic of ω0. This directly demonstrates the connection between time and mass. It allows measurement of microscopic masses with 4 × 10-9 accuracy in the proposed revision to SI units. Together with the Avogadro project, it yields calibrated kilograms.

原文English
頁(從 - 到)554-557
頁數4
期刊Science
339
發行號6119
DOIs
出版狀態Published - 2013 二月 1

All Science Journal Classification (ASJC) codes

  • General

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