连续测量中的状态确定
State determination in continuous measurement
摘要：
在量子轨道理论的框架下，讨论了在连续测量位置后确定量子系统状态的可能性。通过考虑随机主方程下条件密度矩阵的演变来解释系统初始知识的缺乏和外部噪声。它表明，在有限的时间后，系统的状态是一个纯粹的状态，可以推断出单独的测量记录。的关系，不断出现的可能性的连续实验观察的单量子，例如在腔量子电动力学，进行了讨论。
英文摘要：
The possibility of determining the state of a quantum system after a continuous measurement of position is discussed in the framework of quantum trajectory theory. Initial lack of knowledge of the system and external noises are accounted for by considering the evolution of conditioned density matrices under a stochastic master equation. It is shown that after a finite time the state of the system is a pure state and can be inferred from the measurement record alone. The relation to emerging possibilities for the continuous experimental observation of single quanta, as for example in cavity quantum electrodynamics, is discussed.
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