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原文連結
論文資訊
- 類型：已發表論文
- 日期：2013
摘要
An unknown 量子 state of a single system cannot be discovered, as a measured system is reprepared-it jumps into an eigenstate of the measured observable. This impossibility of finding the 量子 state and other symptoms usually blamed on wave-packet collapse follow (as was recently demonstrated for pure states of measured systems) from unitarity (which does not, however, allow for a literal collapse) and from the repeatability of measurements: Continuous unitary 演化 and repeatability suffice to establish the discreteness that underlies 量子 jumps. Here we consider mixed states of a macroscopic, open system (such as an apparatus), and we allow its microscopic state to change when, e.g., measured by an observer, provided that its salient features remain unchanged and that observers regard macroscopic
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