Optimized entropic uncertainty for successive projective measurements

被引：28

作者：

Baek, Kyunghyun ^{[1
]}

Farrow, Tristan ^{[2
,3
]}

Son, Wonmin ^{[1
]}

机构：

[1] Sogang Univ, Dept Phys, Seoul 121742, South Korea

[2] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

[3] Natl Univ Singapore, Ctr Quantum Technol, Singapore 117543, Singapore

来源：

PHYSICAL REVIEW A | 2014年 / 89卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

QUANTUM MEASUREMENTS; DISTURBANCE; PRINCIPLE; OBSERVABLES;

D O I：

10.1103/PhysRevA.89.032108

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We focus here on the uncertainty of an observable Y caused by a precise measurement of X. We illustrate the effect by analyzing the general scenario of two successive measurements of spin components X and Y. We derive an optimized entropic uncertainty limit that quantifies the necessary amount of uncertainty observed in a subsequent measurement of Y. We compare this bound to recently derived error-disturbance relations and discuss how the bound quantifies the information of successive quantum measurements.

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页数：6

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