多模式原子干涉仪的相位研究
The phase evolution of Multimode atom Interferometer

在本文中，我们研究了谐振子势阱中多模式原子干涉仪相位演化的动力学特性.第一次Kapitza-Dirac脉冲产生出了具有不同相位的模式.外场的作用使这些模式的相位演化相对于没有外场下的演化发生了偏离. Kapitza-Dirac脉冲的强度不会对相位演化产生任何影响. 在第二次Kapitza-Dirac脉冲后，外场作用使之前已经存在的非零模式相位发生突变.对于外场是重力场，测量时刻相邻两模式之间的相位差和重力加速度成线性关系.
The phase evolution dynamics of the multimode interferometer for cold atoms confined in a harmonic trap is investigated. Several spatially addressable modes with different phases are created by the first Kapitza-Dirac pulse. The role of external field makes the phase evolution of these models deviate from the evolution of no external field. The strength of the Kapitza-Dirac pulse does not have any effect on phase evolution. After the second Kapitza-Dirac pulse, the external field has caused the mutation of phase of non-zero model before the second Kapitza-Dirac pulse. For the external field being the gravitational field, the phase difference between the two adjacent modes of the measurement time is linearly dependent on the acceleration of gravity.