Quantum measurement of an electron in disordered potential: delocalization versus measurement voltages

Details Quantum measurement of an electron in disordered potential: delocalization versus measurement voltages Quantum measurement of an electron in disordered potential: delocalization versus measurement voltages

2006-03-09

arxiv.org/abs/cond-mat/0603255v1

Phys.Rev.B 73, 035320(2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5pages, 4figures

Scientific paper

10.1103/PhysRevB.73.035320

Quantum point contact (QPC), one of the typical mesoscopic transport devices, has been suggested to be an efficient detector for quantum measurement. In the context of two-state charge qubit, our previous studies showed that the QPC's measurement back-action cannot be described by the conventional Lindblad quantum master equation. In this work, we study the measurement problem of a multi-state system, say, an electron in disordered potential, subject to the quantum measurement of the mesoscopic detector QPC. The effect of measurement back-action and the detector's readout current are analyzed, where particular attention is focused on some new features and the underlying physics associated with the measurement-induced delocalization versus the measurement voltages.

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