J. Phys. B: At. Mol. Opt. Phys. 44, 135506 (2011)

SCI

Joint remote preparation of four-qubit cluster-type states revisited

N. B. An, C. T. Bich and N. V. Don

We revisit the protocols proposed recently (Zhan et al 2011 J. Phys. B: At. Mol. Opt. Phys. 44 095501) for joint remote preparation of four-qubit cluster-type states. We not only point out errors in those protocols but also make considerable improvements. Our protocols, for both the cases of real and complex coefficients of the state to be prepared, consume much less quantum resource as well as classical communication cost.