Implementation of optimal phase-covariant cloning machines

Details Implementation of optimal phase-covariant cloning machines Implementation of optimal phase-covariant cloning machines

2006-09-14

arxiv.org/abs/quant-ph/0609105v1

Phys. Rev. A 76, 012330 (2007)

Physics

Quantum Physics

7 pages, 3 figures

Scientific paper

10.1103/PhysRevA.76.012330

The optimal phase covariant cloning machine (PQCM) broadcasts the information associated to an input qubit into a multi-qubit systems, exploiting a partial a-priori knowledge of the input state. This additional a priori information leads to a higher fidelity than for the universal cloning. The present article first analyzes different experimental schemes to implement the 1->3 PQCM. The method is then generalized to any 1->M machine for odd value of M by a theoretical approach based on the general angular momentum formalism. Finally different experimental schemes based either on linear or non-linear methods and valid for single photon polarization encoded qubits are discussed.

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