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Precision measurement and frequency metrology with ultracold atoms

National Science Review 2016年第2期3卷 189-200页

作者： Xibo Zhang Jun Ye International Center for Quantum Materials School of PhysicsPeking University JILA NIST and University of Colorado

Precision measurement and frequency metrology have pushed many scientific and technological frontiers in the field of atomic,molecular and optical *** this article,we provide a brief review on the recent development of optical atomic clocks,with an emphasis placed on the important inter-dependence between measurement precision and systematic *** presenting a general discussion on the motivation and techniques behind the development of optical lattice clocks,where the use of many atoms greatly enhances the measurement precision,we present the JILA strontium optical lattice clock as the leading system of frequency metrology with the lowest total uncertainty,and we describe other related research *** discuss key ingredients that have enabled the optical lattice clocks with ultracold atoms to reach the 18 th digit in both precision and ***,we discuss extending the power of precision clock spectroscopy to study quantum many-body physics and to provide control for atomic quantum *** addition,we explore future research directions that have the potential to achieve even greater precision.

关键词： ultracold atoms optical atomic clocks precision measurement frequency metrology many-body physics quantum state control

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Optical frequency divider with division uncertainty at the 10-21 level

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National Science Review 2016年第4期3卷 463-469页

作者： Yuan Yao Yanyi Jiang Hongfu Yu Zhiyi Bi Longsheng Ma State Key Laboratory of Precision Spectroscopy East China Normal University Collaborative Innovation Center of Extreme Optics Shanxi University

Optical clocks with unprecedented accuracy of 10promise innovations in many research *** applications rely to a large extent on the ability of precisely converting the frequency from one optical clock to another,or particularly to the frequencies in the iber telecom band for long-distance *** report demonstrates a low-noise,high-precision optical frequency divider,which realizes accurate optical frequency conversion and enables precise measurement of optical frequency *** measuring against the frequency ratio between the fundamental and the second harmonic of a 1064-nm laser instead of a second copy of the same system,we demonstrate that the optical frequency divider has a fractional frequency division instability of 6×10at 1 s and a fractional frequency division uncertainty of 1.4×*** remarkable numbers can support frequency division of the best optical clocks in the world without frequency-conversion-caused degradation of their performance.

关键词： optical frequency comb optical atomic clock precision measurement frequency metrology

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One and Two Photon Excitation of Radiofrequency Trapped Ca

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Chinese Journal of Chemical Physics 2009年第2期22卷 119-122页

作者： C. Zumsteg C. Champenois D. Guyomarc'h G. Hagel M. Houssin M. Knoop Physique des Interactions Ioniques et Moléculaires (CNRS UMR 6633) Université de Provence Centre de Saint Jérome Case C21 13397 Marseille Cedex 20 France

Radiofrequency （rf） trapped ions are versatile candidates for a large panel of applications ranging from quantum information to the creation of cold molecules. Sample size can range from a single to 10^6 ions, and the internal and external energy states of the atoms can be controlled with high precision. In the experiment, we focus on different protocols related to frequency metrology using rf trapped Ca.

关键词： Radiofrequency trapped ion frequency metrology Laser stabilisation

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