Optical Bistability in Semiconductors with Many-body Coulomb Effects

The Bloch-like equations for the intracavityinteraction of coherent light with semiconductors below the Mott density are derived.These equations include the many-body Coulomb effects.Steady state analysis reveals the characteristics of bistability and hysteresis in such systems.It is shown that the hysteresis loops increase and that the bistability can be realized more easily due to the many-body effects.

A Universal Value for the Charge-Transfer States of Different Alkali-Halide Molecules

The scaled potentials were used to discuss the vibrational quantum defects of alkali-halide molecules by using the fully quantal Milne equation method and the quasiclassical Wentzell-Kramers-Briilouin approximation.This allowed us to obtain a universal function and its limit value for the charge-transfer states of different alkali-halide molecules.

集体测量估计量子相干性的性能研究

量子相干性作为资源理论提出后,对它的量化和实验测量的研究一直受到大家广泛的关注。目前已有研究证明集体测量可以提高相干性的测量精度,但在具体实验中实验条件对集体测量估计量子相干性的性能影响还尚不清晰。分别数值模拟了在不同探测效率和资源数条件下集体测量估计相干性的误差,并与其他方法进行了比较。分析发现存在一定参数范围使集体测量的方法在探测效率为60%的情况下比探测效率为90%的态层析的方法更优;此外,随着资源数的增多,集体测量的性能几乎不依赖于量子态和相干性的度量方式,误差均以相同尺度在减小。