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中国物理学会期刊

基于Hardy-type佯谬的混合态高概率量子非局域关联检验

CSTR: 32037.14.aps.68.20191125

Testing quantum nonlocality with high probability using quantum mixed state based on hardy-type paradox

CSTR: 32037.14.aps.68.20191125
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  • 量子非局域关联是量子力学预言的重要现象, 同时也是量子理论区别于经典理论的重要特征之一. 因此, 对量子非局域关联的高成功概率检验有着重要意义. 本文提出了一种基于Hardy-type佯谬的、可用于针对纯态和混合态进行高成功概率量子非局域关联检验的逻辑, 并对其适用性进行了证明. 研究发现, 利用本文提出的检验逻辑对量子纯态进行量子非局域关联检验, 成功检验概率将随着量子纯态的纠缠度增加而出现先增大后减小的现象, 最大的成功检验概率超过39%. 进一步利用提出的检验逻辑, 以Werner态这种量子混合态为例, 进行了针对混合态的量子非局域关联的高概率检验研究. 研究发现, 随着混合态的纯度增加, 成功进行量子非局域关联检验的概率也将增加. 最后给出了针对Werner态这种量子混合态进行高成功概率量子非局域关联检验的条件和范围.

     

    Quantum nonlocality is an important phenomenon predicted by quantum mechanics. It is also one of the most important characteristics that quantum theory is different from classical theory. Therefore, it is of great significance to test the quantum nonlocality with higher successful probability. In this paper, a testing logic based on Hardy-type paradox is proposed and its applicability is proved. Such a logic can be used to test the quantum nonlocality for both the quantum mixed state and the quantum pure state with a high successful probability. It is found that, for quantum pure states, the probability of successfully testing the quantum nonlocality first increases and then decreases with the increase of entanglement degree of quantum states. The maximum successful probability of the testing the quantum pure state is over 39%. Furthermore, taking the Werner-like state, a quantum mixed state for example, the high successful probability of testing the quantum nonlocality is investigated by using the proposed logic. It is found that with the increase of the purity of the quantum mixed state, the successful probability of testing the quantum nonlocal correlation will increase. Finally, the conditions and the range of testing quantum nonlocality with high successful probability for Werner states are given. It is found that for r = 0.599997, the Werner-like quantum mixed state has a maximum range (i.e. \rm Tr(\rho^2) \geqslant 0.874696) of successfully testing the quantum nonlocality.

     

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