Nondestructive Probing Scheme of Quantum State Without Quantum Correlation |
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Authors: | Zhenni Li Chang-shui Yu Shuxue Ding Zunyi Tang |
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Institution: | 1. School of Computer Science and Engineering, University of Aizu, Tsuruga, Ikki-Machi, Aizu-Wakamatsu City, Fukushima, 965-8580, Japan 2. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, China
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Abstract: | We study a scheme that an auxiliary qubit is introduced for probing the information of the given bipartite quantum state, while the correlations of the probed quantum state and even the probed state itself are not disturbed after the probing, which means nondestructive probing. We find that, in order to guarantee the invariance of the correlations of the probed state, neither quantum entanglement nor quantum discord between the auxiliary qubit and the probed states can be present. This could make us reconsider the role of quantum correlation in some quantum information processing tasks. |
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