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Recently, several similar protocols[J. Opt. B 4 (2002) 380; Phys. Lett. A 316(2003) 159; Phys. Lett. A 355 (2006) 285; Phys. Lett. A 336 (2005) 317] forremotely preparing a class of multi-qubit states (i.e, $\alpha|0 ...0>+\beta|1... 1>$) are proposed, respectively. In this paper, by applying thecontrolled-not (CNOT) gate, a new simple protocol is proposed for remotelypreparing such class of states. Compared to the previous protocols, bothclassical communication cost and required quantum entanglement in our protocolare remarkably reduced. Moreover, the difficulty of identifying some quantumstates in our protocol is also degraded. Hence our protocol is more economicaland feasible.

Classical communication and entanglement cost in preparing a class of multi-qubit states