Quantum measurement of an electron in disordered potential: delocalization versus measurement voltages
arXiv:cond-mat/0603255 · doi:10.1103/PhysRevB.73.035320
Abstract
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.
arXiv comment5pages, 4figures
References in corpus (20)
- Single-shot read-out of an individual electron spin in a quantum dot
- Measurements with a noninvasive detector and dephasing mechanism
- Continuous quantum measurement of a double dot
- Continuous weak measurement of quantum coherent oscillations
- Continuous quantum measurement of two coupled quantum dots using a point contact: A quantum trajectory approach
- Dephasing and the Orthogonality Catastrophe in Tunneling through a Quantum Dot: the ``Which Path?'' Interferometer
- Dephasing in a quantum dot due to coupling with a quantum point contact
- Efficiency of Mesoscopic Detectors
- Dynamics of a mesoscopic qubit under continuous quantum measurement
- Measurement induced quantum-classical transition
- Relaxation and Zeno effect in qubit measurements
- Output spectrum of a detector measuring quantum oscillations
- Spontaneous Relaxation of a Charge Qubit under Electrical Measurement
- Delocalization in the Anderson model due to a local measurement
- Measurement Process In a Two-Barrier System
- Continuous quantum measurement: inelastic tunnelling suppresses current oscillations
- Measurement-induced quantum diffusion
- Diffusion in disordered systems under iterative measurement
- Comment on "Continuous quantum measurement: inelastic tunneling and lack of current oscillations"
- Reply to Comment on "Continuous quantum measurement: inelastic tunneling and lack of current oscillations"