Energy flow in a dispersive qubit read-out
Jani Tuorila, E. V. Thuneberg · Journal of Physics Conference Series · 2009
We analyze a superconducting charge qubit that is dispersively coupled to an electric resonator. The system is connected to a transmission line that allows a reflection measurement. In this paper we derive the equations of motion of the system by using the quantum network theory. We assume that the measurement signal is so strong that the resonator behaves classically. The time evolution of the qubit is calculated with the Bloch equations. We have simulated the system in the adiabatic eigenbasis of the qubit to bring out the effects of the changing band curvatures under strong driving. We use circuit theory to calculate the energy flow in different parts of the circuit.