Measuring nonlinear functionals of quantum harmonic oscillator states - art. no. 060501

被引：7
|
作者：
Pregnell, KL [1 ]
机构：
[1] Univ Queensland, Dept Phys, Ctr Quantum Comp Technol, Brisbane, Qld 4072, Australia
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 06期
关键词：
D O I：
10.1103/PhysRevLett.96.060501
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Using only linear interactions and a local parity measurement we show how entanglement can be detected between two harmonic oscillators. The scheme generalizes to measure both linear and nonlinear functionals of an arbitrary oscillator state. This leads to many applications including purity tests, eigenvalue estimation, entropy, and distance measures-all without the need for nonlinear interactions or complete state reconstruction. Remarkably, experimental realization of the proposed scheme is already within the reach of current technology with linear optics.
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页数：4
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