Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement

被引：66

作者：

Sun, F. W. ^{[1
]}

Liu, B. H. ^{[1
]}

Gong, Y. X. ^{[1
]}

Huang, Y. F. ^{[1
]}

Ou, Z. Y. ^{[1
,2
]}

Guo, G. C. ^{[1
]}

机构：

[1] Univ Sci & Technol China, CAS, Key Lab Quantum Informat, Hefei 230026, Peoples R China

[2] Indiana Univ Purdue Univ, Dept Phys, Indianapolis, IN 46202 USA

来源：

EPL | 2008年 / 82卷 / 02期

关键词：

D O I：

10.1209/0295-5075/82/24001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose and demonstrate experimentally a projection scheme to measure the quantum phase with a precision beating the standard quantum limit. The initial input state is a twin Fock state vertical bar N, N > proposed by Holland and Burnett (Phys. Rev. Lett., 71 ( 1993) 1355) but the phase information is extracted by a quantum state projection measurement. The phase precision is about 1.4/N for large photon number N, which approaches the Heisenberg limit of 1/N. Experimentally, we employ a four-photon state from type-II parametric down-conversion and achieve a phase uncertainty of 0.291 +/- 0.001 beating the standard quantum limit of 1/root N = 1/ 2 for four photons. Copyright (c) EPLA, 2008.

引用

页数：5

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