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28 March 2024
 
  » arxiv » cond-mat/0511148

 Article overview


Qubit measurement using a quantum point contact with a quantum Langevin equation approach
Bing Dong ; Norman J. M. Horing ; X. L. Lei ;
Date 7 Nov 2005
Subject Mesoscopic Systems and Quantum Hall Effect
AbstractWe employ a quantum Langevin equation approach to establish non-Markovian dynamical equations, on a fully microscopic basis, to investigate the measurement of the state of a coupled quantum dot qubit by a nearby quantum point contact. The ensuing Bloch equations allow us to examine qubit relaxation and decoherence induced by measurement, and also the noise spectrum of meter output current with the help of a quantum regression theorem, at arbitrary bias-voltage and temperature. Our analyses provide a clear resolution of a recent debate concerning the occurrence of a quantum oscillation peak in the noise spectrum.
Source arXiv, cond-mat/0511148
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