Weekly Papers on Quantum Foundations (37)

When is a set of questions to nature together with sharp answers to those questions in one-to-one correspondence with a set of quantum states?. (arXiv:1909.08834v1 [quant-ph]) 上午9:10 | quant-ph updates on arXiv.org Authors: Inge S. Helland A general question is posed to the quantum community. Partial results are formulated in a self-contained way. In particular, the title question is answered affirmatorily… Read more →

Weekly Papers on Quantum Foundations (36)

Classical causal models cannot faithfully explain Bell nonlocality or Kochen-Specker contextuality in arbitrary scenarios. (arXiv:1909.05434v1 [quant-ph]) 下午12:56 | quant-ph updates on arXiv.org Authors: J. C. Pearl, E. G. Cavalcanti In a recent work, it was shown by one of us (EGC) that Bell-Kochen-Specker inequality violations in phenomena satisfying the no-disturbance condition (a generalisation of the no-signalling condition) cannot in general be explained… Read more →

Weekly Papers on Quantum Foundations (35)

Proposal for a new quantum theory of gravity IV: Black hole entropy from non-commutative geometry and spontaneous localisation. (arXiv:1909.02434v1 [gr-qc]) 下午12:42 | quant-ph updates on arXiv.org Authors: Palemkota Maithresh, Tejinder P. Singh In our recently proposed theory of quantum gravity, a black hole arises from the spontaneous localisation of an entangled state of a large number of atoms of space-time-matter [STM]. Prior… Read more →

Weekly Papers on Quantum Foundations (34)

The Frustration of being Odd: How Boundary Conditions can destroy Local Order. (arXiv:1908.10876v1 [cond-mat.stat-mech]) 上午10:25 | quant-ph updates on arXiv.org Authors: Vanja Marić, Salvatore Marco Giampaolo, Domagoj Kuić, Fabio Franchini A central tenant in the classification of phases is that boundary conditions cannot affect the bulk properties of a system. In this work we show striking, yet puzzling, evidence of a clear violation of… Read more →

Weekly Papers on Quantum Foundations (33)

Weak Gravitational Field Effects on Optical Bell Tests. (arXiv:1908.08179v1 [quant-ph]) 下午12:23 | quant-ph updates on arXiv.org Authors: M. Rivera-Tapia, A. Delgado, G. F. Rubilar The technological refinement of experimental techniques has recently allowed the generation of two-photon polarization entangled states at low Earth orbit, which have been subsequently applied to quantum communications. This achievement paves the way to study the interplay between General… Read more →

Weekly Papers on Quantum Foundations (32)

Critical look at the time-energy uncertainty relations. (arXiv:1908.05273v1 [quant-ph]) 上午9:48 | quant-ph updates on arXiv.org Authors: K. Urbanowski The Heisenberg and Mandelstam-Tamm time-energy uncertainty relations are analyzed. The conlusion resulting from this analysis is that within the Quantum Mechanics of Schr\”{o}dinger and von Neumann, the status of these relations can not be considered as the same as the status of the… Read more →

Weekly Papers on Quantum Foundations (31)

Do the EPR correlations pose a problem for causal decision theory? 上午8:00 | Latest Results for Synthese Abstract We argue that causal decision theory (CDT) is no worse off than evidential decision theory (EDT) in handling entanglement, regardless of one’s preferred interpretation of quantum mechanics. In recent works, Ahmed (Evidence, decision, and causality, Cambridge University Press, Cambridge, 2014) and Ahmed and… Read more →

Beyond Bell?

In a recent archive post ([1]) Shan Gao has argued that quantum theory is incompatible with relativity. He calls this a new proof beyond Bell’s theorem, arguing elsewhere ([2]) that it closes the superdeterminism loophole in Bell’s theorem. Such strong claims must be backed up by irrefutable arguments. My aim in this post to the workshop “Beyond Bell’s theorem” is to refute Gao’s “proof”… Read more →