Experimental phase-covariant cloning of polarization states of single photons

Details Experimental phase-covariant cloning of polarization states of single photons Experimental phase-covariant cloning of polarization states of single photons

2006-07-21

arxiv.org/abs/quant-ph/0607149v1

Phys. Rev. A 74, 042327 (2006).

Physics

Quantum Physics

5 pages, 4 figures, REVTeX4

Scientific paper

10.1103/PhysRevA.74.042327

The experimental realization of optimal symmetric phase-covariant 1->2 cloning of qubit states is presented. The qubits are represented by polarization states of photons generated by spontaneous parametric down-conversion. The experiment is based on the interference of two photons on a custom-made beam splitter with different splitting ratios for vertical and horizontal polarization components. From the measured data we have estimated the implemented cloning transformation using the maximum-likelihood method. The result shows that the realized transformation is very close to the ideal one and the map fidelity reaches 94%.

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