Quantum Measurements Performed with a Single-Electron Transistor

Details Quantum Measurements Performed with a Single-Electron Transistor Quantum Measurements Performed with a Single-Electron Transistor

1998-01-13

arxiv.org/abs/cond-mat/9801125v3

Phys. Rev. B 57, 15400 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures, submitted to Phys. Rev. B, more numerical simulations done

Scientific paper

10.1103/PhysRevB.57.15400

Low-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.

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