依赖强度耦合三光子过程下运动原子最佳熵压缩态的制备

为了研究三光子过程中原子与相干态耦合量子体系信息熵压缩随时间演化规律及原子最佳信息熵压缩态的制备,我们采用全量子理论,推导出运动原子与单模简并三光子依赖强度耦合量子体系的精确解;理论上给出制备原子最佳信息熵压缩态的充分及必要条件,并进行了数值模拟验证.研究结果表明:控制相干态场与原子作用时间,切断相干态场与原子的纠缠,选择二能级原子处于等权重相干叠加态,适当选取相干态场与原子的初始位相,可以制备出原子最佳量子信息熵压缩态;调节光腔中场模结构参量,能够得到连续的量子信息熵压缩态.该研究结果在多光子过程低噪声量子信息处理中具有一定意义.

Preparation of optimal entropy squeezing states with the degeneracy three-photon optical field under the intensity dependent coupling

In order to study preparation of optimal entropy squeezing states for the moving two-level atom entanglement with the degeneracy three-photon optical field under the intensity dependent coupling, the exact solutions of the quantum system are deduced on the basis of the quantum theory and the analytical expressions of the atomic information entropy squeezing state (AOEST) are shown. The sufficient and necessary conditions of preparation of AOEST are researched theoretically and are verified by the numerical simulation. The study results indicate that quantum information entropy squeezing overcomes the mediocrity of compression standard variance, and verifies the high sensitivity of the information entropy squeezing. To choose the atomic initial in a coherent superposition state and the initial phases of atoms and field, the optimal entropy squeezing states can be produced. By adjusting the parameters of the field structure, the optimal entropy squeezed state can be sustained. The research result is of significance in the low noise of quantum information processing.