Abstract

We propose a scheme to accomplish the optimal symmetric quantum cloning machine using a weak cross-Kerr nonlinearity effect without ancillary photons. Normal coherence probe beam and highly efficient homodyne detection are used to construct this near-deterministic equipment. Feed-forward and feed-backward processes are used to improve the efficiency of success. This device can be used for deterministic implementation of both northern and southern hemispheres optimal cloning transformation by adjusting some devices of the quantum circuit conveniently. The actual feasibility of this scheme with current experiment technology in theory is also discussed.

© 2012 Optical Society of America

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