Microstrip resonator as a measuring device for a single molecule magnet

A single molecule magnet (SMM) could be used as a qubit in quantum information processing. In this work, we suggested a method for the measurement of the SMM state with a microstrip resonator. In our method the frequency of the electron spin resonance adiabatically approaches to the fundamental frequency of the microstrip resonator. The shift of the resonator frequency is maximal near the crossing point. This shift depends on the initial state of the SMM and can be used for the measurement of the initial state. We have used the classical approach for description of the SMM dynamics and the interaction between the microstrip and SMM. We have obtained an analytical expression for the resonator maximum frequency shift and performed numerical analysis in the vicinity of the crossing point.