Phys. Rev. A 2022 105 062413]. Here, we want to find whether there are other entangled states that can be shared entanglement arbitrarily many times. In this paper, we consider the problem of sharing quantum entanglement when the initial shared state is a two-qubit entangled Werner state. The goal is to maximize the number of Bobs that can share entanglement with a single Alice. By suitably choosing the entanglement witness operator and the unsharp measurement settings by the Bobs, we prove that there exist two-qubit entangled initial shared Werner states whose entanglement can be detected by arbitrarily many sequential observers Bobs with a single Alice. Then, we also consider the special case of the Werner state, that is, the maximally entangled state as the initial shared state. In this case, its entanglement can also be witnessed arbitrarily many times, and the number of Bobs increases with the decrease of parameter."> - 必威体育下载

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    Yu Xin-Miao, Yang Shu-Yuan, He Kan
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    • Abstract views:2642
    • PDF Downloads:87
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    Publishing process
    • Received Date:25 October 2022
    • Accepted Date:10 January 2023
    • Available Online:11 February 2023
    • Published Online:05 April 2023

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