Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit

被引：329

作者：

Appel, J. ^{[1
]}

Windpassinger, P. J. ^{[1
]}

Oblak, D. ^{[1
]}

Hoff, U. B. ^{[1
]}

Kjaergaard, N. ^{[1
]}

Polzik, E. S. ^{[1
]}

机构：

[1] Univ Copenhagen, Danish Natl Res Fdn Ctr Quantum Opt, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2009年 / 106卷 / 27期

基金：

新加坡国家研究基金会;

关键词：

spin squeezing; quantum nondemolition measurements; atomic clocks; BOSE-EINSTEIN CONDENSATE; SPIN; STATES; SPECTROSCOPY;

D O I：

10.1073/pnas.0901550106

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Squeezing of quantum fluctuations by means of entanglement is a well-recognized goal in the field of quantum information science and precision measurements. In particular, squeezing the fluctuations via entanglement between 2-level atoms can improve the precision of sensing, clocks, metrology, and spectroscopy. Here, we demonstrate 3.4 dB of metrologically relevant squeezing and entanglement for greater than or similar to 10(5) cold caesium atoms via a quantum nondemolition (QND) measurement on the atom clock levels. We show that there is an optimal degree of decoherence induced by the quantum measurement which maximizes the generated entanglement. A 2-color QND scheme used in this paper is shown to have a number of advantages for entanglement generation as compared with a single-color QND measurement.

引用

页码：10960 / 10965

页数：6

共 32 条

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