Photon Storage And Related Properties In Molecular Magnet Media

In recent years,the electromagnetically induced transparency phenomenon has caused widespread interest among researchers in the field of quantum optics.Electromagnetically induced transparency can cause a significant change in the optical properties of the medium,mainly manifested as: the dispersion of the medium is enhanced,the linear absorption is reduced;it is easy to coherently control the conversion between atoms and light quantum states.Therefore,the electromagnetic induction transparent effect is very important,and it has many potential applications.These include quantum information calculation,optical multi-wave mixing,photon storage,inversion-free laser and optical bistable.First,the development history and basic properties of molecular magnets are introduced,and then the Hamiltonian of the interaction between the molecular magnets and the electromagnetic field is given.Using molecular magnet as medium,the process of storage and extraction of probe light was studied.Here,we simplified the molecular magnet into a ?-type four-level model.The propagation equation of the probe field is solved by Schr?dinger equation and its approximate analytical expression is obtained.The process of storing and extracting photons in the probe field is discussed and numerically simulated.Secondly,the electromagnetically induced transparency phenomenon in molecular magnets is theoretically studied.In the dual-type four-level molecular magnet model,the density matrix equation is solved using the probability amplitude method.The results show that the electromagnetically induced transparency phenomenon depends significantly on the detuning of the control field and the frequency of the control field.Next,using the Heisenberg equation to solve density matrix,we theoretically studied the optical bistable state of the molecular magnet system in the ring cavity and its coherent control.The results show that: by controlling the amount of detuning,the level splitting interval Equivalent coupling parameters can make the optical bistable phenomenon obvious.