Abstract

We propose a scheme to realize tunable optimal quantum cloning machines with trapped atoms. Through selecting a pairing of Raman transitions and choosing suitable parameters of the external fields, we can not only realize an optimal symmetric (asymmetric) universal quantum cloning machine and phase-covariant cloning machine, but also an optimal symmetric economical phase-covariant cloning machine. Additionally, the atomic excited states and photonic states can be adiabatically eliminated. In our scheme, the quantum cloning machine can copy the information from one trapped atom to arbitrary two distant trapped atoms, which is significant to quantum communication and quantum computation.

© 2012 Optical Society of America

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