Abstract
We propose a scheme to realize a quantum cloning machine via coupled electron spins in quantum dots. By properly designing the position of the quantum dots and controlling the coupling between them, a multi-purpose quantum cloning machine (MPCM) including an optimal symmetric (asymmetric) 1→2 universal quantum cloning machine (UQCM) and optimal symmetric (asymmetric) 1→2 phase-covariant quantum cloning machine (PCCM) can be achieved.
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