论文标题
通过任意许多独立观察者依次共享三方非局部性
Sharing tripartite nonlocality sequentially by arbitrarily many independent observers
论文作者
论文摘要
存在双方纠缠的状态，其违反clauser-horne shimony-holt（CHSH）铃铛不平等的行为可以通过一个爱丽丝和任意的许多顺序鲍勃[Phys]观察到。莱特牧师。 125，090401（2020）]。在这里，我们考虑了三方系统的类似物：三方纠缠的状态在爱丽丝，鲍勃和多个查理中共享。第一位查理（Charlie）测量了他的Qubit，然后将Qubit传递给下一个查理（Charlie），后者再次测量其他测量等等。目的是最大程度地利用单一爱丽丝和鲍勃（Alice and Bob）观察到某种非局部性的Charlies数量。已经表明，最多可以通过违反Svetlichny的不平等现象，与Alice和Bob [Quantum Inf [Quantum Inf违反了Svetlichny不平等，最多可以共享Greenberger-Horne-Zeilinger（GHz）态的真正非局部性。过程。 18，42（2019）和物理。修订版A 103，032216（2021）]。在这项工作中，我们表明，任意的许多查理可以具有标准的非局部性（通过违反Mermin的不平等），而单个爱丽丝和单个Bob则具有其他类型的非局部性（这被称为真正的非信号非局部性）。
There exist bipartite entangled states whose violations of Clauser-Horne-Shimony-Holt (CHSH) Bell inequality can be observed by a single Alice and arbitrarily many sequential Bobs [Phys. Rev. Lett. 125, 090401 (2020)]. Here we consider its analogues for tripartite systems: a tripartite entangled state is shared among Alice, Bob and multiple Charlies. The first Charlie measures his qubit and then passes his qubit to the next Charlie who measures again with other measurements and so on. The goal is to maximize the number of Charlies that can observe some kind of nonlocality with the single Alice and Bob. It has been shown that at most two Charlies could share genuine nonlocality of the Greenberger-Horne-Zeilinger (GHZ) state via the violation of Svetlichny inequality with Alice and Bob [Quantum Inf. Process. 18, 42 (2019) and Phys. Rev. A 103, 032216 (2021)]. In this work, we show that arbitrarily many Charlies can have standard nonlocality (via violations of Mermin inequality) and some other kind of genuine nonlocality (which is known as genuinely nonsignal nonlocality) with the single Alice and single Bob.
