Efficient Atomic Clocks Operated with Several Atomic Ensembles

被引：53
作者：
Borregaard, J. [1 ]
Sorensen, A. S. [1 ]
机构：
[1] Univ Copenhagen, Niels Bohr Inst, QUANTOP, DK-2100 Copenhagen O, Denmark
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 09期
基金：
新加坡国家研究基金会; 欧洲研究理事会;
关键词：
QUANTUM METROLOGY; PROJECTION NOISE; FREQUENCY; STATES; ION; ENTANGLEMENT; SPECTROSCOPY; STANDARD; LIMIT;
D O I：
10.1103/PhysRevLett.111.090802
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Atomic clocks are typically operated by locking a local oscillator (LO) to a single atomic ensemble. In this Letter, we propose a scheme where the LO is locked to several atomic ensembles instead of one. This results in an exponential improvement compared to the conventional method and provides a stability of the clock scaling as (alpha N)(-m/2) with N being the number of atoms in each of the m ensembles and alpha a constant depending on the protocol being used to lock the LO.
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页数：5
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