301 citations · 1.8k across the 39 of their papers we have counts for
8 papers · 1 filter
A Mapping between the Spin and Fermion Algebra
Felix Meier, Daniel Waltner, Petr Braun +1
We derive a formalism to express the spin algebra in a spin representation in terms of the algebra of fermionic operators that obey the Canonical Anti-co…
Trace formula for spin chains
Daniel Waltner, Petr Braun, Maram Akila +1
While detailed information about the semiclassics for single-particle systems is available, much less is known about the connection between quantum and classical dynamics for many-…
Parametrization of spin-1 classical states
Olivier Giraud, Petr Braun, Daniel Braun
We give an explicit parametrization of the set of mixed quantum states and of the set of mixed classical states for a spin--1. Classical states are defined as states with a positiv…
Multiqubit symmetric states with high geometric entanglement
J. Martin, O. Giraud, P. A. Braun +2
We propose a detailed study of the geometric entanglement properties of pure symmetric N-qubit states, focusing more particularly on the identification of symmetric states with a h…
Quantifying Quantumness and the Quest for Queens of Quantum
Olivier Giraud, Petr A. Braun, Daniel Braun
We introduce a measure of ''quantumness'' for any quantum state in a finite dimensional Hilbert space, based on the distance between the state and the convex set of classical state…
Classicality of spin states
Olivier Giraud, Petr Braun, Daniel Braun
We extend the concept of classicality in quantum optics to spin states. We call a state ``classical'' if its density matrix can be decomposed as a weighted sum of angular momentum…