Unconditional Quantum-Noise Suppression via Measurement-Based Quantum Feedback

被引：55
|
作者：
Inoue, Ryotaro [1 ,2 ]
Tanaka, Shin-Ichi-Ro [1 ]
Namiki, Ryo [1 ]
Sagawa, Takahiro [3 ,4 ]
Takahashi, Yoshiro [1 ,2 ]
机构：
[1] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan
[2] JST, CREST, Saitama 3320012, Japan
[3] Kyoto Univ, Hakubi Ctr Adv Res, Sakyo Ku, Kyoto 6068302, Japan
[4] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 16期
关键词：
LIGHT; SPIN;
D O I：
10.1103/PhysRevLett.110.163602
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We demonstrate unconditional quantum-noise suppression in a collective spin system via feedback control based on quantum nondemolition measurement. We perform shot-noise limited collective spin measurements on an ensemble of 3.7 X 10(5) laser-cooled Yb-171 atoms in their spin-1/2 ground states. Correlation between two sequential quantum nondemolition measurements indicates -0.80(-0.12)(+0.11) dB quantum-noise suppression in a conditional manner. Our feedback control successfully converts the conditional quantum-noise suppression into the unconditional one without significant loss of the noise reduction level. DOI: 10.1103/PhysRevLett.110.163602
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页数：5
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