Non-realism : deep thought or a soft option ?

Comment on 'Non-realism: deep thought or soft option?', by N. Gisin

It is briefly demonstrated that Gisin's so-called 'locality' assumption [arXiv:0901.4255] is in fact equivalent to the existence of a local deterministic model. Thus, despite Gisin's suggestions to the contrary, 'local realism' in the sense of Bell is built into his argument from the very beginning. His 'locality' assumption may more appropriately be labelled 'separability'. It is further noted that the increasingly popular term 'quantum nonlocality' is not only misleading, but tends to obscure the important distinction between no-signalling and separability. In particular, 'local non-realism'…

Mythical Thought in Bohr's Anti-Realist Realism (Or: Lessons on How to Capture and Defeat Smoky Dragons)

In this work we argue that the power and effectiveness of the Bohrian approach to quantum mechanics is essentially grounded on an inconsistent form of anti-realist realism which supports not only the uncritical tolerance -- in physics -- towards the "standard" account of the theory of quanta but also -- in philosophy -- to the mad reproduction of mythical (inconsistent and vague) narratives -- known as "interpretations". We will discuss the existence of -- what John Archibald Wheeler named -- "smoky dragons" not only within the standard formulation of the theory but also within the many interp…

EPR Paradox and Magician's Props

Local realism has been knocked down by the experiments with entangled pairs of particles based on Bell's theorem(J. S. Bell, Physics (Long Island City, N.Y.) 1, 195 (1964)). However, there has been continuing debate on whether locality or realism is the problem. In this work, we analyzed the Einstein-Podolsky-Rosen thought experiment of Bohm's version using information theory and thermodynamics. The inference of non-locality from EPR experiments will be against the principle of non-realism of quantum mechanics. Therefore, the experiments about quantum entanglement cannot provide any proof to a…

Quantum- vs. Macro- Realism: What does the Leggett-Garg Inequality actually test?

Macroscopic Realism (MR) says that a macroscopic system is always determinately in one or other of the macroscopically distinguishable states available to it. The Leggett-Garg (LG) inequality was derived to allow experimental test of whether or not this doctrine is true; it is also often thought of as a temporal version of a Bell-inequality. Despite recent interest in the inequality, controversy remains regarding what would be shown by its violation. Here we resolve this controversy, which arises due to an insufficiently general and model-independent approach to the question so far. We argue t…

用一个玩具机制违反 KCBS 不等式

Violating the KCBS inequality with a toy mechanism

本文提出一个由经典对象生成违反 KCBS 不等式数据的简单玩具机制，以厘清经典实在论、经典性及量子内外语境性的概念界限。

Why $ψ$ is incomplete indeed: a simple illustration

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…