基于双光子的超辐射高精度位移测量

Super-radiant Super-resolving Displacement Measurement by Using Two Photons

通过将多个光动量变换到三能级原子系综,提出了基于双光子达到海森堡极限超辐射高精度的位移测量方案.利用2N个相干脉冲可制备双激发狄拉克态的叠加态,每个狄拉克态由包含4N个分立光动量的超辐射态构成.结果表明,两态间的相位差与原子系综整体位移有关,其测量精度可高达1/8N.同时,利用拉姆齐干涉仪,简单说明了在晶体中本方案实现的可行性.

By encoding multiple light momenta into a three-level atomic ensemble,we propose a super-radiant metrology scheme to achieve Heisenberg limit super-resolving displacement measurement. We use coherent-pulse groups to prepare a two excitation super-radiant state in a superposition of two timed Dicke states that are light momenta apart in the momentum space. The phase difference between these two states induced by a uniform displacement of the atomic ensemble hassensitivity. Experiments based on Ramsey interferometry are proposed in crystal.