We show that the non-locality together with the statistical character makes the world statistically separable. The super-luminal signal transmission is impossible. The quantum theory is therefore consistent with the relativity and the causality.
We provide a new formulation of the Local Friendliness no-go theorem of Bong et al [Nat. Phys. 16, 1199 (2020)] from fundamental causal principles, providing another perspective on how it puts strictly stronger bounds on quantum reality than Bell's theorem. In particular, quantum causal models have been proposed as a way to maintain a peaceful coexistence between quantum mechanics and relativistic causality, while respecting Leibniz's methodological principle. This works for Bell's theorem but does not work for the Local Friendliness no-go theorem, which considers an extended Wigner's Friend s…
Starting with a consideration of the implication of Bell inequalities in quantum mechanics, a new quantum postulate is suggested in order to restore classical locality and causality to quantum physics: only the relative coordinates between detected quantum events are valid observables. This postulate supports the EPR view that quantum mechanics is incomplete, while also staying compatible to the Bohr view that nothing exists beyond the quantum. The new postulate follows from a more general principle of quantum relativity, which states that only correlations between experimental detections of q…
Proposed quantum experiments in deep space will be able to explore quantum information issues in regimes where relativistic effects are important. In this essay, we argue that a proper extension of Quantum Information theory into the relativistic domain requires the expression of all informational notions in terms of quantum field theoretic (QFT) concepts. This task requires a working and practicable theory of QFT measurements. We present the foundational problems in constructing such a theory, especially in relation to longstanding causality and locality issues in the foundations of QFT. Fina…
General physical background of Peres-Horodecki positive partial transpose (ppt-) separability criterion is revealed. Especially, the physical sense of partial transpose operation is shown to be equivalent to the "local causality reversal" (LCR-) procedure for all separable quantum systems or to the uncertainty in a global time arrow direction in all entangled cases. Using these universal causal considerations the heuristic causal separability criterion has been proposed for arbitrary $ D^{N} \times D^{N}$ density matrices acting in $ \mathcal{H}_{D}^{\otimes N} $ Hilbert spaces which describe …
Nordita, Stockholm University and KTH Royal Institute of Technology(诺尔迪塔,斯德哥尔摩大学和皇家理工学院);School of Mathematics and Physics, The University of Queensland(昆士兰大学数学与物理学院);Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and School of Electrical, Electronic and Mechanical Engineering, University of Bristol(布里斯托大学量子工程技术实验室、H.H.威尔斯物理实验室和电气、电子与机械工程学院);H. H. Wills Physics Laboratory, University of Bristol(布里斯托大学H.H.威尔斯物理实验室);Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel(格勒诺布尔阿尔卑斯大学、法国国家科学研究中心、格勒诺布尔国立理工学院、内耳研究所);University of Vienna, Faculty of Physics, Vienna Doctoral School in Physics, and Vienna Center for Quantum Science and Technology (VCQ)(维也纳大学物理学院、维也纳物理博士学校和维也纳量子科学与技术中心(VCQ));Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences(奥地利科学院量子光学与量子信息研究所(IQOQI));Sorbonne Université, CNRS, LIP6(索邦大学、法国国家科学研究中心、LIP6实验室)
A Proposed Test of the Local Causality of Spacetime
一个支配时空中度规场和物质场的理论是{ \it local causal},如果任何区域中场的概率分布完全由该区域过去的物理数据决定,也就是说,它与类空分离点上的事件无关。广义相对论显然是局部因果的,因为一个区域中的场完全由其过去的物理数据决定。人们自然会问,在其他可能的理论中,时空的基本描述是经典的和几何的--例如,将经典时空几何随机耦合到物质的量子场论的假设理论--是否也可能是局部因果的。另一方面,引力的量子理论应该允许在宏观水平上违反局域因果关系的时空的创造。本文描述了一个实验来检验时空的局域因果关系,从而检验引力是否像引力的量子理论所建议的那样在这方面表现。这个实验要么直接证明引力场不是局部因果的,从而证明量子引力是弱的;要么为量子理论的有效性确定一个明确的界限。
我们研究了时间问题的三个方面:广义相对论和量子理论对时间的处理之间的分歧,从一个孤立的宇宙中恢复时间的问题以及单向时间流的流行(即,所谓的时间之箭(arrow of time)。在我们的解释下,广义相对论和量子理论有互补的时间处理,因为它们是从一个更基本的理论中产生的。为了模拟一个孤立的宇宙,我们使用惠勒-德威特方程,然后应用佩奇-伍特斯恢复时间的方法。有人认为,如果恢复的时间经验确实是可行的,在这个框架中,相互作用和量子纠缠都是必不可少的功能,即使前者通常是事后的想法或完全驳回。至于时间的单向箭头,从我们的角度来看,这是包括上述相互作用的结果。但在我们的解释和几乎所有其他解释的基础上,是因果关系的必要性。正是这一基本原则解释了我们对时间的经验,但它只能被假定。我们的结论是,“因果关系问题”应成为今后调查的焦点。