王和闫设计出利用两步方法确定性地实现远程制备单粒子态,受到这个思想的启发,研究了任意形式双粒子态的远程制备.在此方案中,两个非最大纠缠GHZ态用作量子通道,制备者Alice将已知态的全部信息分割为两部分,一部分为实系数部分,另一部分为相因子部分.制备者Alice执行两次投影测量并将测量结果用4比特经典信息告诉Bob,远方接收者Bob可以通过合适的幺正变换以概率4|βγ|2成功地获得目标态,此成功概率比刘的方案高,这也是本方案的优点所在,因为在刘的方案中只有二粒子实系数态或赤道态的远程制备才能达到这个概率值.
Inspired by the idea of Wang and Yan's,i.e.,a two-step exact remote state preparation (RSP) of an arbitrary qubit,the remote preparation of arbitrary two-qubit state was studied.In the scheme,two non-maximally entangled GHZ states act as quantum channels.The sender Alice divides the full information encoded in known state into two parts,one purely real coefficient and the other purely real phase factor.After twice projective measurements and the transmission of 4-bit classical information by Alice,the remote receiver Bob can obtain the desired state with the success probability 4|βγ|2 which is higher than that in Liu's protocol and it is also the advantage of our scheme,because only two-qubit state in real Hilbert space or equatorial-like state can reach this success probability value in Liu's protocol.
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