Variance-based uncertainty relation for incompatible observers

被引：7
|
作者：
Zheng, Xiao [1 ]
Zhang, Guo-Feng [1 ]
机构：
[1] Beihang Univ, Sch Phys & Nucl Energy Engn, Key Lab Micronano Measurement Manipulat & Phys, Minist Educ, Xueyuan Rd 37, Beijing 100191, Peoples R China
来源：
QUANTUM INFORMATION PROCESSING | 2017年 / 16卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Uncertainty; Mixedness; Equality; QUANTUM; PRINCIPLE;
D O I：
10.1007/s11128-017-1619-6
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Based on mixedness definition as M = 1 - tr (rho(2)), we obtain a new variance-based uncertainty equality along with an inequality for Hermitian operators of a single-qubit system. The obtained uncertainty equality can be used as a measure of the system mixedness. A qubit system with feedback control is also exploited to demonstrate the new uncertainty.
引用
收藏
页数：10
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