Research On Preparation Of Quantum State Based On Rydberg Blockade Mechanism

The Rydberg state indicates that the extranuclear electrons are far away from the nucleus(which can be much larger than the size of the nucleus).Therefore,the Rydberg state has high ionization energy,which is easy to interact with microwave field,RF electric field and classical laser field,and has a long life.An atom with a Rydberg state is called the Rydberg atom.There is a dipole-dipole interaction between the Rydberg atoms,the long-range van der Waals force.Due to the exaggerated properties of the low temperature Rydberg gas,it provides a good platform for exploring quantum physics,so when studying three two-level Rydberg atoms and two three-level Rydberg atoms,we are all assume in the frozen Rydberg atomic gas.With the development of quantum information technology,we are increasingly using Rydberg atoms as research objects,because the Rydberg atomic array can produce Rydberg blockade and antiblockade effects.In this paper,three two-level Rydberg atomic arrays are established.There is a long-range interaction between atom and atom,and there is a time-dependent sinusoidal RF electric field between the ground state and the Rydberg state.The time-dependent sinusoidal RF electric field can make the Rydberg atomic array produces blockade and antiblockade dynamics.When the frequency of the driving field is small and the long-range interaction force is weak,the model can still generate Rydberg blockade,which provides a valuable theoretical basis for quantum information technology.We also studied the effects of different arrangements of three atoms on Rydberg's blockade and antiblockade.The two-level Rydberg atomic model can be extended to the three-level Rydberg atom.We first study the structure of the Rydberg atom is(43)stytle,using the time-dependent sinusoidal RF field between the ground state and the Rydberg state can Generate blockade and antiblockade dynamics.When the structure of the three-level Rydberg atom is cascaded,the frequency of the driving field is much larger than the Rabi frequency(ie,the large detuning condition),and the perfect oscillation of the population of the ground state and the single excited state can be achieved.We also explored the effects of atomic dissipation on Rydberg's blockade.Rydberg atom is a hot research today,because the properties of the quantum gate are realized by the properties of Rydberg atoms,such as the CZ gate,which is the phase reversal of the quantum state.We discuss the system without detuning and detuning,and the RF electric field is constant and time-dependent.Under the four conditions,we all have realized the quantum CZ gate.