振幅相干态的量子相位密度分布

Quantum Phase Density Distribution of Amplitude Coherent States

研究了振幅相干态的Pegg-Barnett量子相位密度分布,结果发现,1)影响振幅相干态的量子相密度分布P(θ,m)的物理条件有:真空态|O〉与是相干态|α〉相叠加的角度φ,平均光子数和量子相位角θ与相干态移动相位角γ的相对值θ-γ。2)量子相密度分布相对φ、θ-γ作周期变化;它随平均光子数的增大而增大;一定条件下φ、θ-γ影响振幅相干态的量子相密度分布的极值。

Pegg-Barnett Quantum phase density distribution properties of amplitude coherent states are studied. It is find that： 1. the Quantum phase density distribution of amplitude coherent states p（θ,m） is influenced by superposition angle φ which is the vacuum state ｜o〉 superposed by coherent state｜α〉, average photon number and θ-γ that is the quantum phase θ minus displace angle of coherent state γ. 2. the quantum phase density distribution changes with φ and θ-γ periodically; it becomes large with increase of average photon numbers. Under certain conditions, extremums of quantum phase density distribution are restricted by φ and θ-γ.