论文标题
由多个顺序观察者对真正的爱因斯坦 - 波多尔斯基 - 罗森 - 罗森态转向
Genuine Einstein-Podolsky-Rosen steering of three-qubit states by multiple sequential observers
论文作者
论文摘要
我们研究了多种使用三量状态的单一副本来进行真正的三方面爱因斯坦 - 波多尔斯基 - 罗森（EPR）转向的可能性。在两个翅膀的两个固定观察者之间共享了格林伯格 - 霍恩 - 齐伊林格（GHz）型或w型的纯三分之一状态，在两个翅膀的两个固定观察者之间共享，在第三翼中，在执行Unsharp或非铅测量的第三翼中有一系列多个观察者。第三翼中每个观察者中每个观察者的测量设置的选择都是独立的，并且与先前观察者的测量设置和结果无关。我们研究了上述设置中的所有可能类型（2-> 1）和（1-> 2）真正的三方转向。对于每种情况，我们都会获得第三翼观察者数量的上限，他们可以通过违反三方转向不平等的行为来证明真正的EPR转向。我们表明，与W状态相比，GHz状态允许更高数量的观察者。此外，（1-> 2）与（2-> 1）转向案例相比，更大范围的清晰度参数可以进行转向。
We investigate the possibility of multiple use of a single copy of three-qubit states for genuine tripartite Einstein-Podolsky-Rosen (EPR) steering. A pure three-qubit state of either the Greenberger-Horne-Zeilinger (GHZ)-type or W-type is shared between two fixed observers in two wings and a sequence of multiple observers in the third wing who perform unsharp or non-projective measurements. The choice of measurement settings for each of the multiple observers in the third wing is independent and uncorrelated with the measurement settings and outcomes of the previous observers. We investigate all possible types of (2->1) and (1->2) genuine tripartite steering in the above set-up. For each case, we obtain an upper limit on the number of observers on the third wing who can demonstrate genuine EPR steering through violation of a tripartite steering inequality. We show that the GHZ state allows for a higher number of observers compared to that for W state. Additionally, (1->2) steering is possible for a larger range of the sharpness parameter compared to that for the (2->1) steering cases.
