Quantum correlations generation and distribution in a universal covariant quantum cloning circuit

We discussed the distribution and generation of quantum correlations in a universal covariant quantum cloning circuit. Specifically, we first considered the distribution of quantum correlation, i.e., quantum discord, among the four qubits of the circuit. Then, we analyzed the generation of genuine 3...

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Bibliographic Details
Published in:Science China. Information sciences 2017-12, Vol.60 (12), p.244-251, Article 122501
Main Author: Ren, Xijun
Format: Article
Language:English
Subjects:
Asymmetry
Circuits
Cloning
Computer Science
Correlation
Information Systems and Communication Service
Quantum entanglement
Qubits (quantum computing)
Research Paper
协变
和分布
广义
操作能力
电路
量子克隆
量子关联
量子纠缠
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Summary:We discussed the distribution and generation of quantum correlations in a universal covariant quantum cloning circuit. Specifically, we first considered the distribution of quantum correlation, i.e., quantum discord, among the four qubits of the circuit. Then, we analyzed the generation of genuine 3-or 4-qubit entanglement in the cloning process. It is found that the circuit generates genuine 4-qubit GHZ（GreenbergerHorne-Zeilinger）-type state while only W-type 3-qubit state could be generated. These results illustrate the special quantum correlation manipulation capabilities of the cloning circuit.
ISSN:1674-733X
1869-1919
DOI:10.1007/s11432-016-0569-2