Information gain versus coupling strength in quantum measurements
arXiv:1203.2251 · doi:10.1103/PhysRevA.85.042330
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.
arXiv comment7 pages, 1 figures
References in corpus (14)
- Introducing Quantum Discord
- Classical, quantum and total correlations
- The Role of Relative Entropy in Quantum Information Theory
- The Uncertainty Principle in the Presence of Quantum Memory
- Quantum State Disturbance vs. Information Gain: Uncertainty Relations for Quantum Information
- Complex weak values in quantum measurement
- Experimental investigation of the entanglement-assisted entropic uncertainty principle
- Entropic uncertainty relation for mutually unbiased bases
- Correlations in local measurements on a quantum state, and complementarity as an explanation of nonclassicality
- Quantum measurements with preselection and postselection
- Weak Measurements Beyond the Aharonov-Albert-Vaidman Formalism
- Optimum Unambiguous Discrimination of Linearly Independent Pure States
- Information-disturbance tradeoff in quantum measurements
- Complementarity of information sent via different bases