论文标题
并发与共同信息之间的相关性
Correlation between concurrence and mutual information
论文作者
论文摘要
我们研究了一个两分的系统，以了解并发和相互信息之间的关系，其中前者决定了量子纠缠的量，而后者是执行局部投射测量后的经典残留物。对于给定的随机纯状态的合奏，其中并发值均匀分布，我们计算并发和互信息的关节概率。尽管零共同信息在统一的集合中最有可能，但我们发现经典信息与并发之间的正相关。该结果表明，经典信息的破坏性测量可用于评估量子信息的量。
We investigate a two-qubit system to understand the relationship between concurrence and mutual information, where the former determines the amount of quantum entanglement, whereas the latter is its classical residue after performing local projective measurement. For a given ensemble of random pure states, in which the values of concurrence are uniformly distributed, we calculate the joint probability of concurrence and mutual information. Although zero mutual information is the most probable in the uniform ensemble, we find positive correlation between the classical information and concurrence. This result suggests that destructive measurement of classical information can be used to assess the amount of quantum information.
