Experimental asymmetric phase-covariant quantum cloning of polarization qubits

Abstract

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.

7 pages, 8 figures

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Cited by in corpus (7)

• Quantum Cloning Machines and the Applications
• Experimental linear-optical implementation of a multifunctional optimal qubit cloner
• Experimental hybrid quantum-classical reinforcement learning by boson sampling: how to train a quantum cloner
• Compensating for Beamsplitter Asymmetries in Quantum Interference Experiments
• Experimental demonstration of optimal universal asymmetric quantum cloning of polarization states of single photons by partial symmetrization
• Projecting onto any two-photon polarization state using linear optics
• Photonic quantum simulator for unbiased phase covariant cloning