Experimental asymmetric phase-covariant quantum cloning of polarization qubits

Details Experimental asymmetric phase-covariant quantum cloning of polarization qubits Experimental asymmetric phase-covariant quantum cloning of polarization qubits

2008-10-15

arxiv.org/abs/0810.2635v1

Physics

Quantum Physics

7 pages, 8 figures

Scientific paper

10.1103/PhysRevA.78.052323

We report on two optical realizations of the $1 \to 2$ asymmetric phase-covariant cloning machines for polarization states of single photons. The experimental setups combine two-photon interference and tunable polarization filtering that enables us to control the asymmetry of the cloners. The first scheme involves a special unbalanced bulk beam splitter exhibiting different splitting ratios for vertical and horizontal polarizations, respectively. The second implemented scheme consists of a balanced fiber coupler where photon bunching occurs, followed by a free-space part with polarization filters. With this later approach we were able to demonstrate very high cloning fidelities which are above the universal cloning limit.

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