在热原子气室中,利用电磁感应透明动力学过程实现了相干态正交分量的存储与释放。利用平衡零拍探测方法测量了三种不同输入光子数时,探针光输入脉冲和恢复信号的正交分量,得到了正交分量随本地振荡光位相变化的分布图。实验结果表明,在不同平均光子数输入时正交分量随本地振荡光位相均匀分布,平均幅值的振幅随着光子数增加而增加。此外,还测量了正交分量恢复信号随存储时间的变化,得到了存储寿命为32μs。
We experimentally realized storing and retrieving quadrature components of coherent state in a warm rubidium vapor by dynamic eleetromagnetically induced transparency. Balanced homodyne detection measurements on the input and retrieved signals are made to measure the quadrature components of coherent light state. We measured the quadrature components as a function of local oscillator phase with three different input signal photon levels and the retrieved signals at different storage time. The experimental re suit indicated that the amount of quantum noise of quadrature components was distributed evenly in time and the amplitude of quadrature values is increase with increasing the input signal photon level. Besides that, the lifetime of quantum memory for quadrature components is 32 μs.