CAJ | 학술논문

在卫星导航系统中,常用的时间同步方法可以提供纳 s 级同步精度,为突破经典无线电理论的测量精度而利用纠缠光子对的量子测量方法可提供 fs 级测量精度。基于量子光学的二阶相关函数定义,对自发参量下转换过程产生量子纠缠光子对的二阶相关函数在晶体范围内进行柱面积分,代入波矢量的一阶展开,积分结果得到二阶相关函数与测量时间差的关系。基于二阶相关函数的时间相关性,提出一种星地时钟同步测量方案。仿真表明：在理想情况下二阶相关函数反映时间精度达70 fs,文中设计方案同步测量精度可达140 fs。
재위성도항계통중,상용적시간동보방법가이제공납 s 급동보정도,위돌파경전무선전이론적측량정도이이용규전광자대적양자측량방법가제공 fs 급측량정도。기우양자광학적이계상관함수정의,대자발삼량하전환과정산생양자규전광자대적이계상관함수재정체범위내진행주면적분,대입파시량적일계전개,적분결과득도이계상관함수여측량시간차적관계。기우이계상관함수적시간상관성,제출일충성지시종동보측량방안。방진표명：재이상정황하이계상관함수반영시간정도체70 fs,문중설계방안동보측량정도가체140 fs。
The time synchronization accuracy on the order of nanoseconds can be provided using the conven-tional methods of time synchronization,a higher measurement accuracy on the order of femto-seconds can be reached by quantum measurement which employs entangled photon pairs in order to break the limit of measurement accuracy of conventional methods.The second-order correlation function of the entangled photon pairs which produced in a spontaneous type-Ⅱ parametric down-conversion is investigated by inte-gral transforming in the nonlinear crystal and substituting the first order expand of the wave vector.The relation between the second-order correlation function and temporal difference.A quantum method in clock synchronization between satellite and ground station is proposed based on the temporal correlation.The simulation indicates that the measurement accuracy provided by the second-order correlation function can be 70 femto-seconds and the synchronization accuracy in the scheme can be 140 femto-seconds in the ideal case.