Han Xin-Hong, Qian Tian, Dong Shan-Chuan, Wang Shuo, Xiao Ya, Gu Yong-Jian
College of Physics and Optoelectronic Engineering, Ocean University of China, Qingdao, 266100, People's Republic of China.
College of Computer Science and Technology, Shandong University of Technology, Zibo, 255000, People's Republic of China.
Sci Rep. 2024 May 20;14(1):11462. doi: 10.1038/s41598-024-61649-4.
Einstein-Podolsky-Rosen (EPR) steering is commonly shared among multiple observers by utilizing unsharp measurements. Nevertheless, their usage is restricted to local measurements and does not encompass all nonlocal measurement-based cases. In this work, a method for finding beneficial local measurement settings has been expanded to include nonlocal measurement cases. This method is applicable for any bipartite state and offers benefits even in scenarios with a high number of measurement settings. Using the Greenberger-Horne-Zeilinger state as an illustration, we show that employing unsharp nonlocal measurements can activate the phenomenon of steering sharing in contrast to using local measurements. Furthermore, our findings demonstrate that nonlocal measurements with unequal strength possess a greater activation capability compared to those with equal strength. Our activation method generates fresh concepts for conservation and recycling quantum resources.
爱因斯坦 - 波多尔斯基 - 罗森（EPR）引导通常通过使用非锐测量在多个观察者之间共享。然而，它们的使用仅限于局部测量，并不涵盖所有基于非局部测量的情况。在这项工作中，一种寻找有益局部测量设置的方法已扩展到包括非局部测量情况。该方法适用于任何二分态，并且即使在具有大量测量设置的场景中也具有优势。以格林伯格 - 霍恩 - 泽林格态为例，我们表明与使用局部测量相比，采用非锐非局部测量可以激活引导共享现象。此外，我们的研究结果表明，强度不等的非局部测量比强度相等的非局部测量具有更大的激活能力。我们的激活方法为量子资源的守恒和回收产生了新的概念。
