Archives by date

You are browsing the site archives by date.

Weekly Papers on Quantum Foundations (4)

Does the Universe have a Hard Drive?. (arXiv:1701.07161v1 [physics.pop-ph] CROSS LISTED)  hep-th updates on on 2017-1-28 2:52am GMT Authors: Zura Kakushadze We discuss an apparent information paradox that arises in a materialist's description of the Universe if we assume that the Universe is 100% quantum. We discuss possible ways out of the paradox, including that Laws of Nature are not... Read more →

Electron-photon interaction and thermal disequilibrium irreversibility

Umberto Lucia (Politecnico di Torino) Atoms continuously interact with the photons of the electromagnetic fields in their environment. This electromagnetic interaction is the consequence of the thermal non-equilibrium. It introduces an element of randomness to atomic and molecular motion, which brings to the decreasing of path information required for microscopic reversibility of evolution. In any atomic electron-photon interaction an energy... Read more →

Weekly Papers on Quantum Foundations (3)

Wigner-Araki-Yanase theorem beyond conservation laws  PRA: Fundamental concepts on 2017-1-20 3:00pm GMT Author(s): Mikko Tukiainen The ability to measure every quantum observable is ensured by a fundamental result in quantum measurement theory. Nevertheless, additive conservation laws associated with physical symmetries, such as the angular momentum conservation, may lead to restrictions on the measurability of the observables.… [Phys. Rev. A 95,... Read more →

Duration and its Relationship to the Structure of Space-Time

Andreas Schlatter The notion of duration is a fundamental feature of intuitive time. Under the assumption that the duration of a measurement is defined to produce a result with certainty, we define a universal observer who observes the position of a physical system. We investigate what conclusions for the structure of space-time the universal observer can draw. It turns out that the perspective... Read more →

Weekly Papers on Quantum Foundations (2)

Weak values obtained from mass-energy equivalence  PRA: Fundamental concepts on 2017-1-13 3:00pm GMT Author(s): Miao Zhang Quantum weak measurement, measuring some observable quantities within the selected subensemble of the entire quantum ensemble, can produce many interesting results such as the superluminal phenomena. An outcome of such a measurement is the weak value which has been applied to amplify some weak... Read more →

Weekly Papers on Quantum Foundations (1)

[Perspective] The fragility of distant Cooper pairs  Science: Current Issue on 2017-1-06 12:00am GMT The first superconductor was discovered in 1911, when elemental mercury was cooled below the helium liquefaction temperature. Suddenly, it ceased to show any resistance to the flow of electricity. Soon after, it became clear that some metals become superconducting upon cooling, and some do not. Half... Read more →