A classification of finite quantum kinematics

16th Symmetries in Science

Tolar, J.^1

Department of Physics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Behová 7, Prague 1

115 19, Czech Republic^1

关键词: Algebraic approaches;    Associative algebras;    Finite dimensions;    Finite quantum systems;    Fundamental theorems;    Mathematical formalism;    Physical realization;    Prime decomposition;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/538/1/012020/pdf
DOI  :  10.1088/1742-6596/538/1/012020

来源: IOP

【 摘 要 】

Quantum mechanics in Hilbert spaces of finite dimension N is reviewed from the number theoretic point of view. For composite numbers N possible quantum kinematics are classified on the basis of Mackey's Imprimitivity Theorem for finite Abelian groups. This yields also a classification of finite Weyl-Heisenberg groups and the corresponding finite quantum kinematics. Simple number theory gets involved through the fundamental theorem describing all finite discrete Abelian groups of order N as direct products of cyclic groups, whose orders are powers of not necessarily distinct primes contained in the prime decomposition of N. The representation theoretic approach is further compared with the algebraic approach, where the basic object is the corresponding operator algebra. The consideration of fine gradings of this associative algebra then brings a fresh look on the relation between the mathematical formalism and physical realizations of finite quantum systems.