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Recently, Bich et al. (Int. J. Theor. Phys. 51: 2272, 2012) proposed twodeterministic joint remote state preparation (JRSP) protocols of an arbitrarysingle-qubit state: one is for two preparers to remotely prepare for a receiverby using two Einstein-Podolsky-Rosen (ERP) pairs; the other is its generalizedform in the case of arbitrary N>2 preparers via N ERP pairs. In this paper,Through reviewing and analyzing Bich et al.'s second protocols with N>2preparers, we find that the success probability P_{suc}=1/4 < 1. In order tosolve the problem, we firstly constructed two sets of projective measurementbases: the real-coefficient basis and the complex-coefficient one, and furtherproposed an improved deterministic N-to-one JRSP protocol for an arbitrarysingle-qubit state with unit success probability (i.e, P_{suc}=1). Morever, ourprotocol is also flexible and convenient, and it can be used in a practicalnetwork.

Improved Deterministic N-To-One Joint Remote Preparation of an Arbitrary Qubit via EPR Pairs