Qubit measurement using a quantum point contact with a quantum Langevin equation approach

Details Qubit measurement using a quantum point contact with a quantum Langevin equation approach Qubit measurement using a quantum point contact with a quantum Langevin equation approach

2005-11-07

arxiv.org/abs/cond-mat/0511148v2

Phys. Rev. B 74, 033303 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, submitted, published version in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.74.033303

We 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.

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