Research On The Quantum Precision Measurement Based On The Atom-light Hybrid SU(1,1) Interferometer

How to efficiently enhance the Raman scattering has attracted a great deal of interest.A new scheme can produce the strong Stokes light using the correlation-enhanced mechanism.The correlation enhanced Raman scattering can be used to compose an SU(1,1)-type hybrid light-atom interferometer.This type of interferometer has many advantages compared with all-optical or all-atomic interferometers.In order to describe the physics process succinctly,firstly,an idealized few-mode model is introduced,and we calculate the phase sensitivities and the signal-to-ratios(SNRs)of the SU(1,1)-type hybrid correlated interferometer.For studying the effects of spatial propagation on phase measure precision,a proper model involving spatial propagation is given.In practical experimental situations,losses cannot be avoided.Therefore,we introduce losses into the few-mode model,the difference of the effects of loss of light field and atomic decoherence in the interferometer is analyzed.Then we calculate the linear correlation coefficients(LCCs),studying the effects of losses on the intermode correlation of the different Raman amplification processes of the atom-light interferometer.The loss of light field and atomic decoherence will degrade the sensitivities and the SNRs,which can be explained from the break of decorrelation conditions of the optimal points.