双模压缩光量子测距方案

Quantum Ranging Scheme Based on Two-Mode Squeezing Light

针对多光子纠缠测距方案量子态的产生和保持困难及量子关联测距中利用光路延迟法进行测距时量程有限的问题,设计了基于双模压缩态和平衡零拍探测的量子测距方案。利用双模压缩光束对应正交分量在同步时关联性最大的性质,对参考信号光电流进行时间延迟实现距离参数的测量,在双平衡零拍探测器对纠缠光束正交分量探测的基础上,分别提出了相关函数估计法、关联噪声估计法和关联矩阵分析法以实现量子测距的延迟时间估计,并进行了相应的理论证明和原理性仿真验证,结果表明,提出的量子测距方案是可行的。

A quantum ranging scheme based on two-mode squeezing and homodyne detector is proposed to avoid the difficulties of generating and maintaining of quantum states in multi-photon entangled ranging schemes and opticaldelay-caused measuring range blocking in quantum correlation distance ranging schemes.Using the character that the two-mode squeezing beams has the largest cross-correlation of the corresponding quadrature of the two modes when the synchronization,the reference photocurrent is delayed to match the signal photocurrent in order to acquire the distance ranging.On the basis of double balanced homodyne detector to detect the quadrature of entangled light beam,the methods of correlation function estimation,correlation noise estimation and correlation matrix analysis are proposed to estimate the delay time,respectively.The theoretical demonstration and simulation verifications show that the proposed quantum ranging scheme has certain feasibility and practical significance.