Quantum-limited measurement and information in mesoscopic detectors
- 28 April 2003
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 67 (16) , 165324
- https://doi.org/10.1103/physrevb.67.165324
Abstract
We formulate general conditions necessary for a linear-response detector to reach the quantum limit of measurement efficiency, where the measurement-induced dephasing rate takes its minimum possible value. These conditions are applicable to both noninteracting and interacting systems. We assess the status of these requirements in an arbitrary noninteracting scattering-based detector, identifying the symmetries of the scattering matrix needed to reach the quantum limit. We show that these conditions are necessary to prevent the existence of information in the detector that is not extracted in the measurement process.Keywords
All Related Versions
This publication has 17 references indexed in Scilit:
- Efficiency of Mesoscopic DetectorsPhysical Review Letters, 2002
- The role of relative entropy in quantum information theoryReviews of Modern Physics, 2002
- Information-tradeoff relations for finite-strength quantum measurementsPhysical Review A, 2001
- Statistics and Noise in a Quantum Measurement ProcessPhysical Review Letters, 2000
- Shot noise in mesoscopic conductorsPhysics Reports, 2000
- Controlled Dephasing of Electronsviaa Phase Sensitive DetectorPhysical Review Letters, 2000
- Dephasing and the Orthogonality Catastrophe in Tunneling through a Quantum Dot: The “Which Path?” InterferometerPhysical Review Letters, 1997
- Random-matrix theory of quantum transportReviews of Modern Physics, 1997
- Gauge-invariant nonlinear electric transport in mesoscopic conductorsEurophysics Letters, 1996
- Quantum-state disturbance versus information gain: Uncertainty relations for quantum informationPhysical Review A, 1996