Ultrafast Coherent Superposition State Preparation Based On Adiabatic Shortcut Technology

The essential difference between quantum system and classical system is coherent super position state.The coherent super position play a critical role in Modern quantum physics and technology.Which have been applied in several aspects,including highly sensitive magnetometer,coherent layout capture,quantum entanglement,electromagnetic induction transparency,quantum information and computation.We used stimulated Raman adiabatic technology(STIRAP).chirped pulse technology,?pulse technology,fraction stimulated Raman adiabatic technology(f-STIRAP)to prepare coherent superposition states.Stimulated Raman adiabatic technique(STIRAP)is the most common methods.However,there are some disadvantage about this technique.In order to result the problem.This paper elaborate a process simplifying a four-level system into two three-level system to prepare the coherent superposition sates.In the first part,we introduce the background and basic theoretical knowledge of this paper,in order to explain the rapid preparation of coherent superposition states.In the second part,we introduce the semi-classical theory of the interaction between light and matter.In the third part,we introduce the basic theory of adiabatic shortcut and its application in two-level and three-level systems,which lays a foundation for the main content of this paper.In order to better introduce the core content of this paper.In the fourth part,we mainly introduce how the four-level system can realize the rapid preparation of the coherent superposition state without satisfying the adiabatic condition,and study the fast preparation of coherent superposition states by introducing a pulse to eliminate the non-adiabatic coupling in the Loop-STIRSAP.The pump pulses and stokes pulses were redesigned to eliminate the non-adiabatic coupling and to realize the fast preparation of coherent superposition states under the Modified STIRSAP protocol with large detuning.In the fifth part,we mainly introduce the summary of the full text and the prospect of the fast preparation of coherent superposition states.