Information gain versus coupling strength in quantum measurements
Quantum Physics
2012-05-08 v2
Abstract
We investigate the relationship between the information gain and the interaction strength between the quantum system and the measuring device. A strategy is proposed to calculate the information gain of the measuring device as the coupling strength is a variable. For qubit systems, we prove that the information gain increases monotonically with the coupling strength. It is obtained that the information gain of the projective measurement along the x-direction reduces with the increasing of the measurement strength along the z-direction, and a complementarity of information gain in the measurements along those two directions is presented.
Keywords
Cite
@article{arxiv.1203.2251,
title = {Information gain versus coupling strength in quantum measurements},
author = {Xuanmin Zhu and Yuxiang Zhang and Quanhui Liu and Shengjun Wu},
journal= {arXiv preprint arXiv:1203.2251},
year = {2012}
}
Comments
7 pages, 1 figures