The Study Of Telecloning For Quantum State

Since the concept of quantum communication has been proposed, the study of teleportation, key distribution, telecloning is increasing. Because of the quantum no-cloning, it is impossible to clone arbitrary unknown quantum state accurately, but the unknown quantum state can be approximated cloning, optimal cloning. This paper studies the quantum state of a telecloning program, the main contents are as follows:1、 Introduces some basic knowledge of quantum computation and quantum information.2、 Proposed two kinds of scheme to realize the telecloning of an unknown single state, The first use the basic forms of W states as quantum channel, to teleclone, arbitrary single particle quantum state. One of the recipients to obtain a copy of the original unknown state, the other recipient get the orthogonal complement state of the original unknown state(imitating clone state), the fidelity of the clone state and imitation clone state are equal. The program does not require the introduction of auxiliary particle and thus is more economical. Another we also proposed the application of combination state of GHZ state and Bell state as the quantum channel, and the cavity QED system to realize the telecloning, the output state fidelity can be as high as5/6.3、 Use two four-particle entangled states as quantum channel, to realize the1→2telecloning scheme with unknown three-particle entangled GHZ state, the results show that the most high fidelity output state is25/36. This program is also extended to the1→2telecloning of unknown N-particle entangled GHZ state.