Figure 1

Schematic of energy level in a system of molecular magnets. Two strong magnetic fields \(H_{c}\) and \(H_{d}\) drive the transition from \(|2\rangle \) to \(|3\rangle, |4\rangle \), respectively. A quantum electromagnetic wave \(\hat{H'}_{p}\) of frequency \(\omega _{p}\) drives transition from \(|1\rangle \) to \(|3\rangle \), then a mixing field is generated with frequency \(\omega _{m}\). \(\delta _{1}\) and \(\delta _{2}\) are the single photon frequency detuning which are defined as \(\delta _{1}=\omega _{31}-\omega _{p}\), \(\delta _{2}=\omega _{41}-\omega _{m}\)