状态分配可以有多大差异
How much state assignments can differ
摘要：
观察者赋予量子系统的状态取决于该观察者可获得的信息。如果两个或多个观察者对一个系统有不同的信息，他们通常会分配不同的状态。在对观察者如何使用他们的信息给出合理假设的情况下，对什么状态可以被分配有任何限制吗？我们得到了一组一般密度矩阵的充要条件，以表征不同的人可能知道的同一个物理系统。这些条件可以用一个标准来概括，我们称之为兼容性。
英文摘要：
The state that an observer attributes to a quantum system depends on the information available to that observer. If two or more observers have different information about a single system, they will in general assign different states. Is there any restriction on what states can be assigned, given reasonable assumptions about how the observers use their information? We derive necessary and sufficient conditions for a group of general density matrices to characterize what different people may know about one and the same physical system. These conditions are summarized by a single criterion, which we term compatibility.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
