9 papers
Quantum orientation, Noether structure, composition of systems and operations
Heinz-Jürgen Schmidt
In this paper we argue that, in addition to the statistical structure of quantum theory, another structure, referred to here as the ``Noether structure," is necessary to describe t…
On the motion of a point charge in a plate capacitor considering influence effects
Heinz-Jürgen Schmidt, Thomas Bröcker
A point charge between the plates of a capacitor generates an influence charge distribution on the plates that modify the electric field acting upon the point charge. This effect i…
Ground states of classical spin polygons: Rigorous results and examples
Wojciech Florek, Heinz-Jürgen Schmidt, Katarzyna Jaśniewicz-Pacer
We present a comprehensive and rigorous analysis of the lowest energy configurations (LECs) of classical spin polygons characterized by arbitrary couplings between neighboring spin…
Coarse-grained entropy balance of the Szilard engine
Heinz-Jürgen Schmidt, Thomas Bröcker
In order to reconcile the entropy reduction of a system through external interventions that are linked to a measurement with the second law of thermodynamics, there are two main pr…
Galilean decoherence and quantum measurement
Heinz-Jürgen Schmidt
In this study, we present a modified quantum theory, denoted as , which introduces mass-dependent decoherence effects. These effects are derived by averaging the influence…
A generalization of the Choi isomorphism with application to open quantum systems
Heinz-Jürgen Schmidt
Completely positive transformations play an important role in the description of state changes in quantum mechanics, including the time evolution of open quantum systems. One usefu…