CAJ | 학술논문

研究了腔场存在相位耗散时多光子J-C模型中光场、原子和系统的密度算符间距;讨论了原子初始态、光场强度以及腔场耗散系数对密度算符间距的影响;且比较了不同跃迁光子数下体系的密度算符间距.结果发现:①密度算符间距与原子的初始态密切相关.②光场和系统的密度算符间距在耗散腔中作减幅周期振荡最终达到稳定,达到稳定所需时间随腔的耗散系数增大而缩短;而原子的密度算符间距与腔的耗散无关.③随着光场初始强度的增加,光场和系统与各自初始态的偏离程度增大.④对于双光子跃迁,当腔场存在相位损耗时光场和系统的密度算符间距仍作减幅周期振荡,原子仍周期性的回到纯态.但由于光场与原子的纠缠和退纠缠速率加快,密度算符间距在每个周期内振荡加剧.
연구료강장존재상위모산시다광자J-C모형중광장、원자화계통적밀도산부간거;토론료원자초시태、광장강도이급강장모산계수대밀도산부간거적영향;차비교료불동약천광자수하체계적밀도산부간거.결과발현:①밀도산부간거여원자적초시태밀절상관.②광장화계통적밀도산부간거재모산강중작감폭주기진탕최종체도은정,체도은정소수시간수강적모산계수증대이축단;이원자적밀도산부간거여강적모산무관.③수착광장초시강도적증가,광장화계통여각자초시태적편리정도증대.④대우쌍광자약천,당강장존재상위손모시광장화계통적밀도산부간거잉작감폭주기진탕,원자잉주기성적회도순태.단유우광장여원자적규전화퇴규전속솔가쾌,밀도산부간거재매개주기내진탕가극.
In the multi-photon J-C Model in the presence of phase damping of the cavity,the distances between density operators of the field,atom and system are investigated.The effects of atomic initial states,the damping coefficient of cavity and the intensity of field on the distances are discussed.It is found that the distances depend closely on the initial states of atom.The distances of the field and the whole system show damped oscillatory behavior and their amplitudes decrease due to the phase damping.The larger the damping coefficient becomes,the more rapidly the distances of the field and system decay.However,the atomic distance is independent of the phase damping.On the other hand,the stronger the initial intensity of field is,the farer the field and system departure from their initial states.Finally the distances between density operators in this model with one-photon and two-photon transition are compared.For the two-photon transition,the atom still returns to pure state in the same period as that in single-photon transition.But due to the rate of disentanglement and entanglement between atom and field becomes more rapid,the distances oscillate more rapidly within each period.