我们引入了一个两个观察者的全对无的贝尔定理的证明，它减少了所需的量子预测的数量从9 [A。Cabello，Phys. Rev. Lett. 87，010403（2001）; Z.- B. Chen等人，物理修订版信函90，160408（2003）]到4，提供了大量的证据反对当地的现实主义，降低了检测效率的要求，一个决定性的实验测试贝尔定理，并导致贝尔不等式类似Mermin不等式三个观察者[N. D. Mermin，Phys. Rev. Lett. 65，1838（1990）]，但只需要两个观察员。
英文摘要：
We introduce a two-observer all-versus-nothing proof of Bell's theorem which reduces the number of required quantum predictions from 9 [A. Cabello, Phys. Rev. Lett. 87, 010403 (2001); Z.-B. Chen et al., Phys. Rev. Lett. 90, 160408 (2003)] to 4, provides a greater amount of evidence against local realism, reduces the detection efficiency requirements for a conclusive experimental test of Bell's theorem, and leads to a Bell's inequality which resembles Mermin's inequality for three observers [N. D. Mermin, Phys. Rev. Lett. 65, 1838 (1990)] but requires only two observers.
Two-player quantum pseudo-telepathy based on recent all-versus-nothing violations of local realism
我们介绍了两个两人量子伪心灵感应游戏的基础上，最近提出的两个全对无（AVN）证明贝尔定理[A。Cabello，Phys. Rev. Lett. 95，210401（2005）; Phys.Rev.A72，050101（R）（2005）]。这些游戏证明了Broadbent和Methot的主张，即这些AVN证明不排除局部隐藏变量理论，其中可能在同一光锥（quant-ph/0511047）内交换无限信息是不正确的。
"All versus nothing" inseparability for two observers
Bell定理的无不等式证明[A. Cabello，Phys. Rev. Lett. 86，1911（2001）]被公式化为Greenberger-Horne-Zeilinger类证明，只涉及两个观察者。一方面，这种新的方法使我们能够导出一个实验上可检验的贝尔不等式，而这个不等式是量子力学所违背的。另一方面，它导致了一个新的状态独立的证明的Kochen-Specker定理，并提供了一个更广泛的视角之间的关系，主要的证明无隐变量。
High-dimensional monitoring and the emergence of realism via multiple observers
Center for Theoretical Physics, Polish Academy of Sciences（波兰科学院理论物理中心）；Institute of Fundamental Technological Research, Polish Academy of Sciences（波兰科学院基础技术研究所）；International Centre for Theory of Quantum Technologies, University of Gdańsk（格但斯克大学量子技术理论国际中心）；Universiteit Leiden（莱顿大学）
We show that rejection of local realism in quantum mechanics can be tested by Bell-type inequalities for two observers and low-order moments of continuous and unbounded observables. We prove that one requires three observables for each observer for a maximally entangled state and two observables for a non-maximally entangled state and write down appropriate inequalities and show violation by quantum examples. Finding an example for quadratures or position and momentum is left as an open problem.
We investigate the scenario where an observer, Alice, shares a two-qubit state with an arbitrary number of observers, Bobs, via sequentially and independently recycling the qubit in possession of the first Bob. It is known that there exist entangled states which can be used to have an arbitrarily long sequence of Bobs who can violate the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality with the single Alice. We show that there exist entangled states that do not violate the Bell inequality and whose entanglement can be detected by an arbitrary number of Bobs by suitably choosing the entangleme…
The Greenberger-Horne-Zeilinger (GHZ) puzzle has been used to study quantum nonlocality and provide an all-or-nothing, no-go theorem for local hidden-variable models. Recent experiments using coincident-detected entangled photons prepared in a three-particle GHZ state have been used to test quantum nonlocality, but fail to rule out local realism due to a reliance on the fair-sampling hypothesis and insufficient detection efficiency. This paper describes a physically motivated local hidden-variable model based on amplitude-threshold detection that is capable of producing similar results. Detect…
With the Nobel Prize attributed to Aspect, Clauser, and Zeilinger, the international scientific community acknowledged the fundamental importance of the experimental violation of Bell's inequalities. It is however still debated what fails in Bell's hypotheses, leading to these inequalities, and usually summarized as "local realism", or maybe more appropriately "classical local realism". The most common explanation is "quantum non-locality", that remains however fully compatible with relativistic causality; this makes wondering whether any non-local phenomenon is really involved in these experi…
Closing objectivity loophole in Bell tests on a public quantum computer
University of Warsaw（华沙大学）；Departament de Física and Institut d’Aplicacions Computacionals de Codi Comunitari (IAC3)（物理系与通用代码计算应用研究所（IAC3））；CRISP – Centre de Recerca Independent de sa Pobla（萨波布拉独立研究中心（CRISP））；University of Lodz（罗兹大学）；Center for Theoretical Physics, Polish Academy of Sciences（波兰科学院理论物理中心）
The Everett Box is a device in which an observer and a lethal quantum apparatus are isolated from the rest of the universe. On a regular basis, successive trials occur, in each of which an automatic measurement of a quantum superposition inside the apparatus either causes instant death or does nothing to the observer. From the observer's perspective, the chances of surviving $m$ trials monotonically decreases with increasing $m$. As a result, if the observer is still alive for sufficiently large $m$ she must reject any interpretation of quantum mechanics which is not the many-worlds interpreta…
Against Absolute Actualization: Three "Non-Localities" and Failure of Model-External Randomness made easy with Many-Worlds Models including Stronger Bell-Violation and Correct QM Probability
