Heisenberg-Type Quantum Steering by Continuous Weak Measurement in Circuit QED *

Zhong Wang

Fig. 1 (Color online) The evolution of terms in the steering parameter. System parameters are $\chi=0.1$ MHz, $\kappa=100$ MHz, $\epsilon_m=400$ MHz, $\Delta=2.5$ GHz. (a) $|\sigma_i^{(1)}|$ when $\varphi=0$. (b) $\Delta\sigma_i^{(1)}$ when $\varphi=0$. (c) $|\sigma_i^{(2)}|$ when $\varphi=\pi/2$. (d) $\Delta\sigma_i^{(2)}$ when $\varphi=\pi/2$. In all sub-figures blue, green, and red represents $x$, $y$, and $z$ respectively.