109 research outputs found
Reply to Comment on "A local realist model for correlations of the singlet state"
The general conclusion of Seevinck and Larsson is that our model exploits the
so-called coincidence-time loophole and produces sinusoidal (quantum-like)
correlations but does not model the singlet state because it does not violate
the relevant Bell inequality derived by Larsson and Gill, since in order to
obtain the sinusoidal correlations the probability of coincidences in our model
goes to zero. In this reply, we refute their arguments that lead to this
conclusion and demonstrate that our model can reproduce results of photon and
ion-trap experiments with frequencies of coincidences that are not in conflict
with the observations.Comment: Corrected typo
Event-by-event simulation of quantum phenomena: Application to Einstein-Podolosky-Rosen-Bohm experiments
We review the data gathering and analysis procedure used in real
Einstein-Podolsky-Rosen-Bohm experiments with photons and we illustrate the
procedure by analyzing experimental data. Based on this analysis, we construct
event-based computer simulation models in which every essential element in the
experiment has a counterpart. The data is analyzed by counting single-particle
events and two-particle coincidences, using the same procedure as in
experiments. The simulation models strictly satisfy Einstein's criteria of
local causality, do not rely on any concept of quantum theory or probability
theory, and reproduce all results of quantum theory for a quantum system of two
particles. We present a rigorous analytical treatment of these models
and show that they may yield results that are in exact agreement with quantum
theory. The apparent conflict with the folklore on Bell's theorem, stating that
such models are not supposed to exist, is resolved. Finally, starting from the
principles of probable inference, we derive the probability distributions of
quantum theory of the Einstein-Podolsky-Rosen-Bohm experiment without invoking
concepts of quantum theory.Comment: Published paper with minor correction
Direct observation of the thermal demagnetization of magnetic vortex structures in non-ideal magnetite recorders
The thermal demagnetization of pseudo-single-domain (PSD) magnetite (Fe3O4) particles, which govern the magnetic signal in many igneous rocks, is examined using off-axis electron holography. Visualization of a vortex structure held by an individual Fe3O4 particle (~ 250 nm in diameter) during in situ heating is achieved through the construction and examination of magnetic-induction maps. Step-wise demagnetization of the remanence-induced Fe3O4 particle upon heating to above the Curie temperature, performed in a similar fashion to bulk thermal demagnetization measurements, revealed its vortex state remains stable under heating close to its unblocking temperature, and is recovered upon cooling with the same or reversed vorticity. Hence, the PSD Fe3O4 particle exhibits thermomagnetic behavior comparable to a single-domain carrier, and thus vortex-states are considered reliable magnetic recorders for paleomagnetic investigations
- …