采用双模压缩态的光子纠缠光纤陀螺仪研究

Study on Photon Entangled Fiber Optic Gyroscope Using Two-Mode Squeezed State

对采用双模压缩态的光子纠缠光纤陀螺仪进行了理论研究,采用角动量理论首次推导了双模压缩态输入的光子纠缠光纤陀螺仪的相位检测灵敏度,并证明了当光子数足够大时,可以达到海森堡极限。针对采用双模压缩态的光子纠缠光纤陀螺仪的二阶符合计数探测方案远未达到海森堡极限的情况,通过考察光子纠缠光纤陀螺仪各输出态的二阶符合计数对总的二阶相关光强的贡献,发现二阶符合计数探测方案存在量子增强信息的抵消,也即其中一个接收端光子数为偶数的输出态和光子数为奇数的输出态的二阶符合计数形成互补的倍频干涉条纹,进而相互抵消。因此,需要优化探测方案,提取完整的量子增强信息,才能实现海森堡极限的相位检测灵敏度。

The photon entangled fiber optic gyroscope with two-mode squeezed state is studied theoretically. The phase detection sensitivity of photon entangled fiber optic gyroscope with two-mode squeezed state input is derived for the first time using angular momentum theory. It is proved that when the number of photons is large enough, the Heisenberg limit can be reached. In view of the fact that the second-order coincidence count detection scheme of photon entangled fiber optic gyroscope using two-mode squeezed state is far from reaching the Heisenberg limit, by investigating the contribution of the second-order coincidence count of each output state of photon entangled fiber optic gyroscope to the total second-order correlation light intensity, it is found that the second-order coincidence count detection scheme has a cancellation on quantum enhanced information, that is, the frequency doubling interference fringes of the second-order coincidence count of the output state with even photon number and the output state with odd photon number at one receiving end are complementary, which cancel each other. Therefore, it is necessary to optimize the detection scheme and extract complete quantum enhancement information to achieve the phase detection sensitivity of Heisenberg limit.