Controlled-Joint Remote Preparation of an Arbitrary Two-Qubit State via Non-maximally Entangled Channel |
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Authors: | Xiao-Wei Guan Xiu-Bo Chen Yi-Xian Yang |
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Affiliation: | 1. School of Mathematical Sciences, Peking University, Beijing, 100871, China 2. Information Security Center, Beijing University of Posts and Telecommunications, Beijing, 100876, China 3. State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
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Abstract: | In this paper, we make a study on how to efficiently transmit an arbitrary two-qubit pure state to remote receiver via non-maximal entangled quantum channel. As a special case, in the first section we present a controlled-joint remote state preparation scheme based on maximally entangled channel. By some local convertible projective measurement bases, two message carriers and one controller can help the receiver Charlie reconstruct the desired state with success probability p=100 %. Then, we extend it to the case of non-maximally entangled channel. Utilizing positive operator-valued measure (POVM) measurement instead of projective measurement, the controller can assist the two senders to fulfill the task. Compared with some previous schemes, our protocol will succeed with a higher probability. And success or failure will only depend on the controller’s measurement outcome, but has nothing to do with two senders’ measurement results. |
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