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Special relativity forbids superluminal influences. Using only theno-signaling principle and an assumption about the form of the Schmidtdecomposition, we show that for "any" allowed fidelity there is a "unique"approximate qubit cloner which can be written explicitly. We introduce theprime cloners whose fidelities have multiplicative property and show that thefidelity of the prime cloners for the infinite copy limit is 1/2.

Application of the no-signaling principle to obtain quantum cloners for any allowed value of fidelity