Physics – Quantum Physics
Scientific paper
2012-01-30
Physics
Quantum Physics
8pages, 5 figures
Scientific paper
We present the first experimental implementation of a multifunctional optimal quantum cloner. Previous implementations have always been designed to optimize the cloning procedure with respect to one single type of it a priori information about the cloned state. In contrast, our "all in one" implementation is optimal for several prominent regimes such as universal cloning, phase-covariant cloning and also, the first ever realized mirror phase-covariant cloning, when the square of the expected value of Pauli's Z operator is known in advance. In all these regimes the experimental device yields clones with almost maximum achievable average fidelity (97.5% of theoretical limit). Our device has a wide range of possible applications in quantum information processing especially in quantum communication. For instance, one can use it for incoherent and coherent attacks against a variety of cryptographic protocols including the BB84 protocol of quantum key distribution through the Pauli damping channels. It can be also applied as a state-dependent photon multiplier in practical quantum networks.
Bartkiewicz Karol
Cernoch Antonin
Lemr Karel
Miranowicz Adam
Soubusta Jan
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