The roles of quantum correlations in quantum cloning
Jun Zhang, Shao-xiong Wu, and Chang-shui Yu
TL;DR
This paper investigates how various quantum correlations, such as entanglement and discord, influence different quantum cloning schemes, revealing that some can operate without quantum correlations.
Contribution
It provides a detailed analysis of the roles of quantum correlations in state-dependent and probabilistic quantum cloning, highlighting their dependence on the cloning machine and the cloned state.
Findings
Quantum correlations vary with the cloning machine and state.
Cloning can be achieved without quantum correlations.
Tripartite entanglement among output modes is analyzed.
Abstract
In this paper, we study the entanglement and quantum discord of the output modes in the unified state-dependent cloning and probabilistic quantum cloning. The tripartite entanglement among the output modes and the quantum cloning machine is also considered. We find that the roles of the quantum correlations including the bipartite and tripartite entanglement and quantum discord strongly depend on the quantum cloning machines as well as the cloned state. In particular, it is found that this quantum cloning scheme can be realizable even without any quantum correlation.
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