Quantum cloning of orthogonal qubits

Details Quantum cloning of orthogonal qubits Quantum cloning of orthogonal qubits

2001-10-02

arxiv.org/abs/quant-ph/0110016v1

Phys. Rev. A 65, 040302(R) (2002).

Physics

Quantum Physics

4 pages, 1 figure, RevTeX 4

Scientific paper

10.1103/PhysRevA.65.040302

An optimal universal cloning transformation is derived that produces M copies of an unknown qubit from a pair of orthogonal qubits. For M>6, the corresponding cloning fidelity is higher than that of the optimal copying of a pair of identical qubits. It is shown that this cloning transformation can be implemented probabilistically via parametric down-conversion by feeding the signal and idler modes of a nonlinear crystal with orthogonally polarized photons.

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