Weak Measurement of Qubit Oscillations with Strong Response Detectors: Violation of the Fundamental Bound Imposed on Linear Detectors
arXiv:0806.2502 · doi:10.1103/PhysRevB.79.075320
Abstract
We investigate the continuous weak measurement of a solid-state qubit by single electron transistors in nonlinear response regime. It is found that the signal-to-noise ratio can violate the universal upper bound imposed quantum mechanically to any linear response detectors. We understand the violation by means of the cross-correlation of the detector currents.
4 pages, 4 figures
References in corpus (6)
- Quantum-Limited Measurement and Information in Mesoscopic Detectors
- Spontaneous Relaxation of a Charge Qubit under Electrical Measurement
- Continuous quantum measurement with independent detector cross-correlations
- Calculation of the current noise spectrum in mesoscopic transport: an efficient quantum master equation approach
- Quantum Nondemolition Measurement of a Kicked Qubit
- Quantum measurement characteristics of double-dot single electron transistor