Impact of non-unitary spin squeezing on atomic clock performance

被引：27

作者：

Braverman, Boris ^{[2
,3
]}

Kawasaki, Akio ^{[4
,5
]}

Vuletic, Vladan ^{[1
]}

机构：

[1] MIT, Dept Phys, Harvard Ctr Ultracold Atoms, Cambridge, MA 02139 USA

[2] Univ Ottawa, Dept Phys, 25 Templeton St, Ottawa, ON K1N 6N5, Canada

[3] Univ Ottawa, Max Planck Ctr Extreme & Quantum Photon, 25 Templeton St, Ottawa, ON K1N 6N5, Canada

[4] Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA

[5] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

来源：

NEW JOURNAL OF PHYSICS | 2018年 / 20卷

关键词：

atomic clocks; precision sensors; quantum entanglement; spin squeezing; antisqueezing; STANDARD QUANTUM LIMIT; ENTANGLEMENT; STATES; SPECTROSCOPY; NOISE; TIMES;

D O I：

10.1088/1367-2630/aae563

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spin squeezing is a form of entanglement that can improve the stability of quantum sensors operating with multiple particles, by inducing inter-particle correlations that redistribute the quantum projection noise. Previous analyses of potential metrological gain when using spin squeezing were performed on theoretically ideal states, without incorporating experimental imperfections or inherent limitations which result in non-unitary quantum state evolution. Here, we show that potential gains in clock stability are substantially reduced when the spin squeezing is non-unitary, and derive analytic formulas for the clock performance as a function of squeezing, excess spin noise, and interferometer contrast. Our results highlight the importance of creating and employing nearly pure entangled states for improving atomic clocks.

引用

页数：12

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