量子纠缠
国家(计算机科学)
物理
量子
量子态
量子力学
量子不和谐
W州
多体纠缠
量子信息
量子位元
作者
Chunhe Xiong,Sunho Kim,Daowen Qiu,Asutosh Kumar,Junde Wu
出处
期刊:arXiv: Quantum Physics
日期:2020-12-07
标识
DOI:10.1103/physreva.105.012426
摘要
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 [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.
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