Phase-covariant quantum cloning of qudits

Details Phase-covariant quantum cloning of qudits Phase-covariant quantum cloning of qudits

2002-05-20

arxiv.org/abs/quant-ph/0205126v3

Phys.Rev.A67,022317 (2003)

Physics

Quantum Physics

Revtex, 6 pages

Scientific paper

10.1103/PhysRevA.67.022317

We study the phase-covariant quantum cloning machine for qudits, i.e. the input states in d-level quantum system have complex coefficients with arbitrary phase but constant module. A cloning unitary transformation is proposed. After optimizing the fidelity between input state and single qudit reduced density opertor of output state, we obtain the optimal fidelity for 1 to 2 phase-covariant quantum cloning of qudits and the corresponding cloning transformation.

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