Efficiency of Mesoscopic Detectors
- 24 October 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 89 (20) , 200401
- https://doi.org/10.1103/physrevlett.89.200401
Abstract
We consider a mesoscopic measuring device whose conductance is sensitive to the state of a two-level system. The detector is described with the help of its scattering matrix. Its elements can be used to calculate the relaxation and decoherence times of the system, and determine the characteristic time for a reliable measurement. We derive conditions needed for an efficient ratio of decoherence and measurement times. To illustrate the theory we discuss the distribution function of the efficiency of an ensemble of open chaotic cavities.Keywords
All Related Versions
This publication has 21 references indexed in Scilit:
- Detection of electron scattering in an isolated double quantum dot systemPhysica E: Low-dimensional Systems and Nanostructures, 2001
- Effects of entanglement in controlled dephasingPhysical Review B, 2001
- Controlled Dephasing of Electronsviaa Phase Sensitive DetectorPhysical Review Letters, 2000
- Charge relaxation and dephasing in Coulomb-coupled conductorsPhysical Review B, 2000
- Measurements with a noninvasive detector and dephasing mechanismPhysical Review B, 1997
- Dephasing and the Orthogonality Catastrophe in Tunneling through a Quantum Dot: The “Which Path?” InterferometerPhysical Review Letters, 1997
- Dephasing in a quantum dot due to coupling with a quantum point contactEurophysics Letters, 1997
- Phase measurement in a quantum dot via a double-slit interference experimentNature, 1997
- Measurements of Coulomb blockade with a noninvasive voltage probePhysical Review Letters, 1993
- Two state systems in media and “Turing's paradox”Physics Letters B, 1982