Optimal Non-Universally Covariant Cloning

Details Optimal Non-Universally Covariant Cloning Optimal Non-Universally Covariant Cloning

2001-01-19

arxiv.org/abs/quant-ph/0101100v1

Physics

Quantum Physics

6 pages

Scientific paper

10.1103/PhysRevA.64.042308

We consider non-universal cloning maps, namely cloning transformations which are covariant under a proper subgroup G of the universal unitary group U(d), where d is the dimension of the Hilbert space H of the system to be cloned. We give a general method for optimizing cloning for any cost-function. Examples of applications are given for the phase-covariant cloning (cloning of equatorial qubits) and for the Weyl-Heisenberg group (cloning of "continuous variables").

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