A universal cloner allowing the input to be arbitrary states in symmetric subspace

Details A universal cloner allowing the input to be arbitrary states in symmetric subspace A universal cloner allowing the input to be arbitrary states in symmetric subspace

2001-07-23

arxiv.org/abs/quant-ph/0107113v2

Physics

Quantum Physics

Revtex, 5 pages

Scientific paper

A generalized universal quantum cloning machine is proposed which allows the input to be arbitrary states in symmetric subspace. And it reduces to the universal quantum cloning machine (UQCM) if the input are identical pure states. The generalized cloner is optimal in the sense we compare the input and output reduced density operators at a single qubit. The result for qubits is extended to arbitrary-dimensional states.

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