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we propose a scheme for physical implementation for the optimal asymmetric (symmetric) 1→2 universal quantum cloning, the optimal symmetric economical 1→3 phase-covariant cloning and the optimal asymmetric (symmetric) real state cloning based on an iSWAP gate between separated nitrogen-vacancy (NV) centers embedded inphotonic crystal cavities. This two-qubit iSWAP gate is produced by the long-range...
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