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...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.展开更多
We propose a scenario to increase the probability of probabilistic quantum deletion and to enhance the fidelity of approximate quantum deletion for two non-orthogonal states via weak measurement.More interestingly,by ...We propose a scenario to increase the probability of probabilistic quantum deletion and to enhance the fidelity of approximate quantum deletion for two non-orthogonal states via weak measurement.More interestingly,by pretreating the given non-orthogonal states,the probability of probabilistic quantum deletion and fidelity of approximate quantum deletion can reach 1.Since outcomes of the weak measurement that we required are probabilistic,we perform the subsequent deleting process only when the outcome of weak measurement is"yes"Remarkably,we find that our scenario has better performance in quantum information process;for example,it costs less quantum resources and time.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 11675119, 11575125, and 11105097)。
文摘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.
基金Nankai Zhide Foundationthe Tianjin Research Innovation Project for Postgraduate Students(Grant No.2019YJSB033)National Natural Science Foundation of China(Grant Nos.11901317 and 11875167)。
文摘We propose a scenario to increase the probability of probabilistic quantum deletion and to enhance the fidelity of approximate quantum deletion for two non-orthogonal states via weak measurement.More interestingly,by pretreating the given non-orthogonal states,the probability of probabilistic quantum deletion and fidelity of approximate quantum deletion can reach 1.Since outcomes of the weak measurement that we required are probabilistic,we perform the subsequent deleting process only when the outcome of weak measurement is"yes"Remarkably,we find that our scenario has better performance in quantum information process;for example,it costs less quantum resources and time.
