Further Aspects of Quantum Observables

Bruce Mills

The observer is herein studied as an aspect of laboratory physics. It is generally accepted that our status as observers is mediated by our material aspects: our body and brain. But, observers are typically equated with classical coordinate systems. An alternative, modelling the observer as a quantum entity, is considered. The corresponding transformations between two quantum observers affect the computed wavefunctions of other quantum entities in a physically meaningful manner.

Bob Coecke, Ross Duncan

Iván Agulló, Anthony J. Brady, Dimitrios Kranas

This work introduces a synergistic combination of analytical methods and numerical simulations to study the propagation of weak wave-packet modes in an optical medium containing the analog of a pair white-black hole. We apply our tools to analyze several aspects of the evolution, such as (i) the region of the parameter space where the analogy with the Hawking effect is on firm ground and (ii) the influence that ambient thermal noise and detector inefficiencies have on the observability of the Hawking effect. We find that aspects of the Hawking effect that are of quantum origin, such as quantum entanglement, are extremely fragile to the influence of inefficiencies and noise. We propose a protocol to amplify and observe these quantum aspects, based on seeding the process with a single-mode squeezed input.

Norbert Brunner, Karl Svozil, Matthias Baaz A

Daegene Song

The nonlocal aspect of entanglement is often considered to show the solid distinguishability of quantum weirdness from classical theory. In this paper, this peculiar facet of entanglement is discussed in light of the observer-dependent subjective model, in which vacuum is filled with the quantum negative sea of the observer's reference frame. The correlation of observers' choices with respect to the observed, as opposed to the ordinary correlation of state vectors with respect to the choice of observables in the observer-independent objective scheme, will be considered. In particular, we will argue that, unlike in the objective model, it is the observers' conscious negative sea that interact and share with each other. The presented discussion is consistent with the previous proposal of continuous or infinite negative sea as an innate aspect of universal grammar shared among observers.