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IFAC Proceedings Volumes

Two-stage general protocol for remote preparation of multi-qubit states

Min Jiang, Min Wan, Shuwen Li, Xu Huang

Published Jan 1, 2013• 0 citations
Publisher
DOI
10.3182/20130902-3-cn-3020.00024

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In this work, we present a general scheme to realize a remote preparation of a class of multi-qubit states (RSP) with real parameters using EPR-type pairs in a deterministic way. Our scheme operates essentially by breaking down the RSP protocol into two phases. In the first phase, the remote preparer can pre-adjust the initial channel to a target channel with proper ancilla-assisted unitary transformation operations. In the second phase, a projective measurement on a group of suitably chosen orthogonal bases is performed by the preparer. The results show that our two-phase RSP protocols are entirely feasible to deterministically prepare a class of multi-qubit states with real parameters for the remote receiver via pre-distributed Bell-type channels. In addition, since the pre-distributed channel could be used in a recursive manner, the efficiency of precious qubit resource can be greatly enhanced.
Quantum noise severely affects the security and reliability of quantum communication system. In this paper, we study the effect of quantum noise on quantum multiparty communication protocols. Taking a two-qubit joint remote state preparation (JRSP) scheme as an example, we point out that there are some calculation mistakes in a former JRSP scheme [X.W. Guan, X.B. Chen, L.C. Wang and Y.X. Yang, Int. J. Theor. Phys. 53(4) (2014) 2236.]. The revised output states and fidelities in two types of noise are presented, respectively. More importantly, we present a more general form for describing the effect of noise on multi-qubit system, which is fit for the case where different types of noise act on the system consecutively. The process of the JRSP scheme in two types of noise is discussed, respectively. It is shown that the noisy effect in the general case is much stronger than the former one for the most part. Our study will be helpful for analyzing the effect of quantum noise on quantum multiparty communication system.