Weak Measurement of Qubit Oscillations with Strong Response Detectors:   Violation of the Fundamental Bound Imposed on Linear Detectors
  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. 
HuJun Jiao, Shi-Kuan Wang, Feng Li, and Xin-Qi Li