Quantum Measurements Performed with a Single-Electron Transistor

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dc.creatorShnirman, Alexander
dc.creatorSchoen, Gerd
dc.date1998-01-13
dc.date1998-02-12
dc.date.accessioned2026-07-07T03:09:47Z
dc.date.available2026-07-07T03:09:47Z
dc.descriptionLow-capacitance Josephson junction systems as well as coupled quantum dots, in a parameter range where single charges can be controlled, provide physical realizations of quantum bits, discussed in connection with quantum computing. The necessary manipulation of the quantum states can be controlled by applied gate voltages. In addition, the state of the system has to be read out. Here we suggest to measure the quantum state by coupling a single-electron transistor to the q-bit. As long as no transport voltage is applied, the transistor influences the quantum dynamics of the q-bit only weakly. We have analyzed the time evolution of the density matrix of the transistor and q-bit when a voltage is turned on. For values of the capacitances and temperatures which can be realized by modern nano-techniques the process constitutes a quantum measurement process.
dc.description7 pages, 4 figures, submitted to Phys. Rev. B, more numerical simulations done
dc.identifierhttps://arxiv.org/abs/cond-mat/9801125
dc.identifierhttp://arxiv.org/abs/cond-mat/9801125
dc.identifierPhys. Rev. B 57, 15400 (1998)
dc.identifierdoi:10.1103/PhysRevB.57.15400
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28022
dc.subjectMesoscale and Nanoscale Physics
dc.subjectQuantum Physics
dc.titleQuantum Measurements Performed with a Single-Electron Transistor
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