The quantum mechanical measurement process is analyzed by means of an explicit generic model describing the interaction between object and measuring device. The solution of the Schrödinger equation for the whole system reflects the ‘collapse’ of the object wave function. A necessary condition is a sufficiently sharply peaked initial measurement device wave function, which is guaranteed in its classical limit. With this assumption, it is in particular proven that the off-diagonal elements of the object density matrix vanish. This study therefore shows the reduction of the object state to be a consequence of Hamiltonian evolution of the total system.

中文翻译：

---

量子力学测量过程

通过描述对象与测量设备之间相互作用的显式通用模型来分析量子力学测量过程。整个系统的薛定ding方程的解反映了物波函数的“崩溃”。必要条件是初始测量设备的波函数必须足够尖锐地达到峰值，这在其经典范围内是可以保证的。在此假设下，特别证明了物体密度矩阵的非对角线元素消失了。因此，这项研究表明对象状态的减少是整个系统的哈密顿进化的结果。