Quantum measurement of coherence in coupled quantum dots

Abstract

We describe the conditional and unconditional dynamics of two coupled quantum dots when one dot is subjected to a measurement of its occupation number using a single electron transistor (SET). The measurement is made when the bare tunneling rate though the SET is changed by the occupation number of one of the dots. We show that there is a difference between the time scale for the measurement-induced decoherence between the localized states of the dots and the time scale on which the system becomes localized due to the measurement. A comparison between theory and current experiments is made.

12 pages, 7 figures

References in corpus (5)

• Quantum Computation with Quantum Dots
• Quantum Manipulations of Small Josephson Junctions
• Measurements with a noninvasive detector and dephasing mechanism
• Quantum Measurements Performed with a Single-Electron Transistor
• Quantum stochastic processes in mesoscopic conductors

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