Condition for any realistic theory of quantum systems.
Condition for any realistic theory of quantum systems.
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DOI：
10.1103/physrevlett.97.180401
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发表时间：
2006-04
影响因子：
8.6
通讯作者：
A. Montina
中科院分区：
文献类型：
--
作者：
A. Montina
在量子物理中，密度算符完全描述状态。相反，在经典物理学中，物理量的平均值是通过概率分布来估计的。我们研究了用经典概率分布和条件概率描述纯量子态和事件的可能性，并证明了这些分布一定是密度算符的非线性函数。文中给出了一些例子。最后，我们讨论了量子物理的指数复杂性问题，并引入了量子系统的经典维度的概念。
In quantum physics, the density operator completely describes the state. Instead, in classical physics the mean value of physical quantities is evaluated by means of a probability distribution. We study the possibility to describe pure quantum states and events with classical probability distributions and conditional probabilities and prove that the distributions have to be nonlinear functions of the density operator. Some examples are considered. Finally, we deal with the exponential complexity problem of quantum physics and introduce the concept of classical dimension for a quantum system.