Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-03-16
Phys. Rev. Lett. 89, 200401 (2002).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.89.200401
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 time of the system, and determine the characteristic time for a reliable measurement. We derive conditions needed for an efficient ratio of decoherence and measurement time. To illustrate the theory we discuss the distribution function of the efficiency of an ensemble of open chaotic cavities.
Buttiker Markus
Pilgram Sebastian
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