Weekly Papers on Quantum Foundations (29)

Spacetime and Physical Equivalence   Fundamental limits on quantum dynamics based on entropy change. (arXiv:1707.06584v1 [quant-ph])  quant-ph updates on arXiv.org on 2017-7-21 2:13am GMT Authors: Siddhartha Das, Sumeet Khatri, George Siopsis, Mark M. Wilde It is well known in the realm of quantum mechanics and information theory that the entropy is non-decreasing for the class of unital physical processes. However, in general, the entropy... Read more →

Weekly Papers on Quantum Foundations (28)

Resolving the observer reference class problem in cosmology  Philsci-Archive: No conditions. Results ordered -Date Deposited. on 2017-7-14 7:20pm GMT Friederich, Simon (2017) Resolving the observer reference class problem in cosmology. Physical Review D, 95 (12). p. 123520. Symmetries and the identity of physical states  Philsci-Archive: No conditions. Results ordered -Date Deposited. on 2017-7-14 7:14pm GMT Friederich, Simon (2016) Symmetries and... Read more →

Weekly Papers on Quantum Foundations (27)

Thermodynamics as a Consequence of Information Conservation. (arXiv:1707.01750v1 [quant-ph])  quant-ph updates on arXiv.org on 2017-7-07 8:21am GMT Authors: Manabendra Nath Bera, Arnau Riera, Maciej Lewenstein, Andreas Winter In this work we formulate thermodynamics as an exclusive consequence of information conservation. The framework can be applied to most general situations, beyond the traditional assumptions in thermodynamics, where systems and thermal-baths could be quantum, of arbitrary... Read more →

Duration and its relation to the structure of space-time II

Andreas Schlatter We assign to the radiation vacuum the role of a universal observer with a corresponding universal clock. By demanding that the thermal clock of a gravitationally accelerated observer in its local rest frame marches in step with the universal one, we derive relations between energy content and geometry of space-time. Full text

Quantum jumps and electrodynamical description

Leonardo Chiatti (ASL VT Medical Physics Laboratory) The customary description of radiation processes provided by Quantum Electrodynamics (QED) allows the quantitative derivation of many physical observables, in line with experiments. This extraordinary empirical success, however, leaves open the problem of the ontology of these processes. We identify these with the discontinuities of the evolution of the quantum state of the... Read more →

Determining the Quantum Expectation Value by Measuring a Single Photon: The first realisation of quantum protective measurements

F. Piacentini, A. Avella, E. Rebufello, R. Lussana, F. Villa, A. Tosi, M. Gramegna, G. Brida, E. Cohen, L. Vaidman, I. P. Degiovanni, M. Genovese Quantum mechanics, one of the keystones of modern physics, exhibits several peculiar properties, differentiating it from classical mechanics. One of the most intriguing is that variables might not have definite values. A complete quantum description provides only probabilities for obtaining various eigenvalues of a quantum variable.... Read more →

Weekly Papers on Quantum Foundations (26)

Simple derivation of the Weyl and Dirac quantum cellular automata  PRA: Quantum information on 2017-6-30 2:00pm GMT Author(s): Philippe Raynal We consider quantum cellular automata on a body-centered cubic lattice and provide a simple derivation of the only two homogenous, local, isotropic, and unitary two-dimensional automata [G. M. D'Ariano and P. Perinotti,Phys. Rev. A 90, 062106 (2014)]. Our derivation relies on... Read more →

Weekly Papers on Quantum Foundations (25)

Fixing extensions to General Relativity in the non-linear regime. (arXiv:1706.07421v1 [gr-qc])  hep-th updates on arXiv.org on 2017-6-24 7:39am GMT Authors: Juan Cayuso, Néstor Ortiz, Luis Lehner The question of what gravitational theory could supersede General Relativity has been central in theoretical physics for decades. Many disparate alternatives have been proposed motivated by cosmology, quantum gravity and phenomenological angles, and have been subjected to... Read more →

Weekly Papers on Quantum Foundations (24)

Aims and Scope of the Special Issue, “Quantum Foundations: Informational Perspective”  Latest Results for Foundations of Physics on 2017-6-17 5:00am GMT Genesis of Karl Popper's EPR-like experiment and its resonance amongst the physics community in the 1980s  ScienceDirect Publication: Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics on 2017-6-16 2:10pm GMT... Read more →