634 citations · 1.2k across the 20 of their papers we have counts for
20 papers
Correlation functions from a unified variational principle: trial Lie groups
Roger Balian, Marcel Veneroni
Time-dependent expectation values and correlation functions for many-body quantum systems are evaluated by means of a unified variational principle. It optimizes a generating funct…
Lectures on dynamical models for quantum measurements
Theo M. Nieuwenhuizen, Marti Perarnau-Llobet, Roger Balian
In textbooks, ideal quantum measurements are described in terms of the tested system only by the collapse postulate and Born's rule. This level of description offers a rather flexi…
A sub-ensemble theory of ideal quantum measurement processes
Armen E. Allahverdyan, Roger Balian, Theo M. Nieuwenhuizen
To elucidate ideal measurements, one must explain how individual events emerge from quantum theory which deals with statistical ensembles, and how different may end up with differe…
Understanding quantum measurement from the solution of dynamical models
Armen E. Allahverdyan, Roger Balian, Theo M. Nieuwenhuizen
The quantum measurement problem, understanding why a unique outcome is obtained in each individual experiment, is tackled by solving models. After an introduction we review the man…
The Quantum Measurement Process: Lessons from an Exactly Solvable Model
Armen E. Allahverdyan, Roger Balian, Theo M. Nieuwenhuizen
The measurement of a spin-$\half$ is modeled by coupling it to an apparatus, that consists of an Ising magnetic dot coupled to a phonon bath. Features of quantum measurements are d…
Phase transitions and quantum measurements
Armen E. Allahverdyan, Roger Balian, Theo M. Nieuwenhuizen
In a quantum measurement, a coupling between the system S and the apparatus A triggers the establishment of correlations, which provide statistical information about S. Robust…