论文标题

非局部性和不相容性破坏量子频道的相互作用

Interplay of nonlocality and incompatibility breaking qubit channels

论文作者

Kumari, Swati, Naikoo, Javid, Ghosh, Sibasish, Pan, A. K.

论文摘要

不兼容和非局限性不仅具有基本利益,而且还充当量子信息理论的重要资源。在Clauser-Horne-Horne-Holton-Holt(CHSH)场景中,已知一对可观察物的不相容性与贝尔非局部性相当。在这里,我们在量子渠道的背景下研究了这些概念。贝尔·奇什(Bell-Chsh)的不等式具有更大的视角 - 与任何真正的三方非局部性场景相比,同时确定了非局部性破坏量子频道和不兼容性破坏量子频道之间的相互作用。在钟声的场景中,我们证明,如果通道的共轭破坏性不兼容,那么该通道本身就是非局部性破坏,反之亦然。但是,由于在多部分场景中不兼容和非局部性之间没有等价关系,因此这种等价性并非直接概括为多部分系统。我们通过考虑一些著名的州,例如Greenberger-Horne-Zeilinger和$ W $州,并使用Mermin和Svetlichny nonlocality的概念来研究三方情况。通过将所讨论的各方纳入Unital Qubit通道,我们确定了与非局部性并存的状态和通道参数的范围。此外,我们确定了Mermin或svetlichny非局部性破坏的一组Unital Qubit通道,无论输入状态如何。

Incompatibility and nonlocality are not only of foundational interest but also act as important resources for quantum information theory. In the Clauser-Horne-Shimony-Holt (CHSH) scenario, the incompatibility of a pair of observables is known to be equivalent to Bell nonlocality. Here, we investigate these notions in the context of qubit channels. The Bell-CHSH inequality has a greater perspective--compared to any genuine tripartite nonlocality scenario--while determining the interplay between nonlocality breaking qubit channels and incompatibility breaking qubit channels. In the Bell-CHSH scenario, we prove that if the conjugate of a channel is incompatibility breaking, then the channel is itself nonlocality breaking and vice versa. However, this equivalence is not straightforwardly generalized to multipartite systems, due to the absence of an equivalence relation between incompatibility and nonlocality in the multipartite scenario. We investigate this relation in the tripartite scenario by considering some well-known states like Greenberger-Horne-Zeilinger and $W$ states and using the notion of Mermin and Svetlichny nonlocality. By subjecting the parties in question to unital qubit channels, we identify the range of state and channel parameters for which incompatibility coexists with nonlocality. Further, we identify the set of unital qubit channels that is Mermin or Svetlichny nonlocality breaking irrespective of the input state.

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