학술논문
Super quantum discord for X-type states.
Document Type
Journal
Author
Li, Tao (PRC-CAP-SM) AMS Author Profile; Ma, Teng (PRC-CAP-SM) AMS Author Profile; Wang, Yaokun (PRC-CAP-SM) AMS Author Profile; Fei, Shaoming (PRC-CAP-SM) AMS Author Profile; Wang, Zhixi (PRC-CAP-SM) AMS Author Profile
Source
Subject
81 Quantum theory -- 81P Axiomatics, foundations, philosophy
81P40Quantum coherence, entanglement, quantum correlations
81P40
Language
English
ISSN
15729575
Abstract
Summary: ``Weak measurement is a new way to manipulate and controlquantum systems. Different from projection measurement, weakmeasurement only makes a small change in status. Applying weakmeasurement to quantum discord, Singh and Pati proposed a new kind ofquantum correlations called `super quantum discord (SQD)' [Ann. Phys.{\bf 343},141(2014)] [MR3176162]. Unfortunately, the superquantum discord is alsodifficult to calculate. There are only few explicit formulae about SQD.We derive an analytical formula of SQD for general X-type two-qubitstates, which surpass the conclusion for Werner states and Belldiagonal states. Furthermore, our results reveal more knowledge aboutthe new insight of quantum correlation and give a new way to compareSQD with normal quantum discord. Finally, we analyze its dynamics undernondissipative channels.''