Information gain versus coupling strength in quantum measurements

Details Information gain versus coupling strength in quantum measurements Information gain versus coupling strength in quantum measurements

2012-03-10

arxiv.org/abs/1203.2251v1

Physics

Quantum Physics

7 pages, 1 figures

Scientific paper

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.

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