Work

Absolutely classical spin states

Year: 2017

Type: article

Abstract: We introduce the concept of ``absolutely classical'' spin states, in analogy to absolutely separable states of bipartite quantum systems. Absolutely classical states are states that remain classical (i.e., a convex sum of projectors on coherent states of a spin $j$) under any unitary transformation applied to them. We investigate the maximal size of the ball of absolutely classical states centered on the maximally mixed state and derive a lower bound for its radius as a function of the total spin quantum number. We also obtain a numerical estimate of this maximal radius and compare it to the case of absolutely separable states.

Source: Physical Review A

DOI: 10.1103/physreva.95.012318

Authors: F. Bohnet-Waldraff, O. Giraud, D. Braun

Institutions: Université Paris-Sud, Centre National de la Recherche Scientifique, Université Paris-Saclay, Laboratoire de Physique Théorique et Modèles Statistiques, University of Tübingen

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funders: Agence Nationale de la Recherche, Labex

Awards: Physics: Atoms, Light, Matter, G4916215809