科研之友
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摘要
A scheme for 1 -> 2 universal telecloning of an arbitrary two-particle entangled state using a single, particular four-particle entangled state as quantum information channel is proposed. The spatially separated two receivers respectively receive one copy of the original unknown state with the fidelity of 5/6 which is independent of the original state and is greater than the one in the currently existing schemes. Our scheme has been generalized to the case of 1 -> N(N > 2) universal 'telecloning of an arbitrary two-particle entangled state. Using this scheme, the spatially separated N receivers respectively obtain one copy with the fidelity of (2N 1)/(3N) which is independent of the original state. Furthermore, we also proposed a scheme using the same four-particle entangled state as quantum information channel with the assistance of multi-target-qubit Control-Not gate and additional qubits, for 1 -> 2 universal teleeloning of an arbitrary n-particle(n <= 3) Greenberger-Horne-Zeilinger (GHZ) state. This scheme is also generalized into the situation of 1 -> N (N > 2) telecloning of an arbitrary n-particle GHZ state. Compared with previous proposals, our schemes require a reduced amount of entangled states as quantum channels to accomplish the task of universal telecloning of entangled state with better fidelity.
