Unified Universal Quantum Cloning Machine and Fidelities

Abstract

We present a unified universal quantum cloning machine, which combines several different existing universal cloning machines together including the asymmetric case. In this unified framework, the identical pure states are projected equally into each copy initially constituted by input and one half of the maximally entangled states. We show explicitly that the output states of those universal cloning machines are the same. One importance of this unified cloning machine is that the cloning procession is always the symmetric projection which reduces dramatically the difficulties for implementation. Also it is found that this unified cloning machine can be directly modified to the general asymmetric case. Besides the global fidelity and the single-copy fidelity, we also present all possible arbitrary-copy fidelities.

4 pages, 2 figures

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Cited by in corpus (12)

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• Unified quantum no-go theorems and transforming of quantum states in a restricted set
• Minimal sets determining universal and phase-covariant quantum cloning
• Probing Quantum Telecloning on Superconducting Quantum Processors
• Quantum superreplication of states and gates
• Variational quantum cloning machine on an integrated photonic interferometer
• Quantum approximated cloning-assisted density matrix exponentiation
• The roles of quantum correlations in quantum cloning