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Classification of states for a given cloner. The blue zone on the surface of the Bloch sphere denotes the pure states whose coherence can not be cloned. The remaining zone is showed by orange colour. C Y L |ψ 1 〉 represents all the states (pure as well as mixed) which have same coherence as |ψ 1 〉 

Classification of states for a given cloner. The blue zone on the surface of the Bloch sphere denotes the pure states whose coherence can not be cloned. The remaining zone is showed by orange colour. C Y L |ψ 1 〉 represents all the states (pure as well as mixed) which have same coherence as |ψ 1 〉 

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It is well known that it is impossible to clone an arbitrary quantum state. However, this inability does not lead directly to no-cloning of quantum coherence. Here, we show that it is impossible to clone the coherence of an arbitrary quantum state which is a stronger statement than the 'no-cloning of quantum state'. In particular, with ancillary sy...

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