Postselected von Neumann measurement characterized by postselection and weak value has been found potential applications in quantum metrology and, solved plenty of fundamental problems in quantum theory. As an application of this new measurement technique in quantum optics, its effects on the features of single-mode radiation fields such as coherent state, squeezed vacuum state and Schrodinger cat sate are investigated by considering full-order effects of unitary evolution. The results show that the conditional probabilities of finding photons, second-order correlation functions, Q-factors and squeezing effects of those states after postselected measurement significantly changed compared with corresponding initial pointer states, respectively.

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后选冯诺依曼测量对单模辐射场特性的影响

具有后选择和弱值特征的后选择冯诺依曼测量在量子计量学中具有潜在应用，解决了量子理论中的大量基本问题。作为这种新测量技术在量子光学中的应用，通过考虑幺正演化的全阶效应，研究了其对相干态、压缩真空态和薛定谔猫态等单模辐射场特征的影响。结果表明，与相应的初始指针状态相比，后选择测量后这些状态的发现光子的条件概率、二阶相关函数、Q因子和压缩效应分别发生了显着变化。