论文标题
使用量子不和谐在状态扩展上表征纠缠
Characterizing entanglement using quantum discord over state extensions
论文作者
论文摘要
我们提出了一个框架，以表征状态扩展的量子不一致（不对称和对称）的纠缠。特别是，我们表明，在状态扩展上，不和谐的距离最小与纠缠的距离相当。从概念上讲，这种等效性将量子不和谐与纠缠更为原始的位置，因为纠缠可以解释为所有国家扩展中不和谐的不可约束部分。基于这种等效性，我们还通过将纠缠距离的距离与量子状态歧视联系起来，提供了纠缠距离的操作含义。此外，对于相对熵部分，我们证明了Devi和Rajagopal引入的纠缠度量[A. R. U. Devi和A. K. Rajagopal，物理。莱特牧师。 100，140502（2008）]实际上等于纠缠的相对熵。我们还基于不和谐措施提供了几种纠缠的量化。
We propose a framework to characterize entanglement with quantum discord, both asymmetric and symmetric, over state extensions. In particular, we show that the minimal Bures distance of discord over state extensions is equivalent to Bures distance of entanglement. This equivalence places quantum discord at a more primitive position than entanglement conceptually in the sense that entanglement can be interpreted as an irreducible part of discord over all state extensions. Based on this equivalence, we also offer an operational meaning of Bures distance of entanglement by connecting it to quantum state discriminations. Moreover, for the relative entropy part, we prove that the entanglement measure introduced by Devi and Rajagopal [A. R. U. Devi and A. K. Rajagopal, Phys. Rev. Lett. 100, 140502 (2008)] is actually equivalent to the relative entropy of entanglement. We also provide several quantifications of entanglement based on discord measures.
