摘要
Quantum steering in a global state allows an observer to remotely steer a subsystem into different ensembles by performing different local measurements on the other part. We show that, in general, this property cannot be perfectly cloned by any joint operation between a steered subsystem and a third system. Perfect cloning is viable if and only if the initial state is of zero discord. We also investigate the process of cloning the steered qubit of a Bell state using a universal cloning machine. Einstein–Podolsky–Rosen(EPR) steering, which is a type of quantum correlation existing in the states without a local-hidden-state model, is observed in the two copy subsystems. This contradicts the conclusion of no-cloning of quantum steering(EPR steering) [C. Y. Chiu et al.,npj Quantum Inf. 2, 16020(2016)] based on a mutual information criterion for EPR steering.
作者
Dian Zhu
Wei-Min Shang
Fu-Lin Zhang
Jing-Ling Chen
朱典;尚为民;张福林;陈景灵(Department of Physics,School of Science,Tianjin University,Tianjin 300072,China;Theoretical Physics Division,Chern Institute of Mathematics,Nankai University,Tianjin 300071,China)
基金
supported by the National Natural Science Foundation of China (Grant Nos. 11675119, 11575125, and 11105097)。
