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Exploration quantum steering nonlocality and entanglement of two-qubit X-state in structured reservoirs

机译:构造油藏中两量子位X态的量子转向非局域性和纠缠

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摘要

In this work, there are two parties, Alice on Earth and Bob on the satellite, which initially share an entangled state, and some open problems, which emerge during quantum steering that Alice remotely steers Bob, are investigated. Our analytical results indicate that all entangled pure states and maximally entangled evolution states (EESs) are steerable, and not every entangled evolution state is steerable and some steerable states are only locally correlated. Besides, quantum steering from Alice to Bob experiences a “sudden death” with increasing decoherence strength. However, shortly after that, quantum steering experiences a recovery with the increase of decoherence strength in bit flip (BF) and phase flip (PF) channels. Interestingly, while they initially share an entangled pure state, all EESs are steerable and obey Bell nonlocality in PF and phase damping channels. In BF channels, all steerable states can violate Bell-CHSH inequality, but some EESs are unable to be employed to realize steering. However, when they initially share an entangled mixed state, the outcome is different from that of the pure state. Furthermore, the steerability of entangled mixed states is weaker than that of entangled pure states. Thereby, decoherence can induce the degradation of quantum steering, and the steerability of state is associated with the interaction between quantum systems and reservoirs.
机译:在这项工作中,有两个方面,即地球上的爱丽丝和卫星上的鲍勃,它们最初共享一个纠缠态,并且研究了一些量子问题,这些问题在爱丽丝遥控鲍勃的量子转向过程中出现。我们的分析结果表明,所有纠缠的纯状态和最大纠缠的演化状态(EES)都是可操纵的,并且并非每个纠缠的演化状态都是可操纵的,并且某些可操纵的状态仅是局部相关的。此外,从爱丽丝到鲍勃的量子控制会随着去相干强度的增加而经历“突然死亡”。但是,此后不久,随着比特翻转(BF)和相位翻转(PF)通道中退相干强度的增加,量子控制经历了恢复。有趣的是,尽管它们最初共享一个纠缠的纯态,但所有EES都是可操纵的,并服从PF和相位阻尼通道中的Bell非局部性。在BF通道中,所有可操纵状态都可以违反Bell-CHSH不等式,但是某些EES无法用于实现操纵。但是,当它们最初共享一个纠缠的混合状态时,其结果不同于纯状态。此外,纠缠混合态的可操纵性比纠缠纯态的可操纵性弱。因此,退相干会引起量子控制的退化,并且状态的可操纵性与量子系统和储层之间的相互作用有关。

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