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

引用

页数：5

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