TY - JOUR

T1 - The problem of dispersion-free probabilities in Gleason-type theorems for a two-dimensional Hilbert space

AU - Bolotin, Arkady

N1 - Publisher Copyright:
© 2018, Chapman University.

PY - 2019/6/1

Y1 - 2019/6/1

N2 - As it is known, Gleason’s theorem is not applicable for a two-dimensional Hilbert space since in this situation Gleason’s axioms are not strong enough to imply Born’s rule thus leaving room for a dispersion-free probability measure, i.e., one that has only values 0 and 1. To strengthen Gleason’s axioms one must add at least one more assumption. But, as it is argued in the present paper, alternatively one can give up the lattice condition lying in the foundation of Gleason’s theorem. Particularly, the lattice structure based on the closed linear subspaces in the Hilbert space could be weakened by the requirement for the meet operation to exist only for the subspaces belonging to commutable projection operators. The paper demonstrates that this weakening can resolve the problem of the dispersion-free probability measure in the case of a qubit.

AB - As it is known, Gleason’s theorem is not applicable for a two-dimensional Hilbert space since in this situation Gleason’s axioms are not strong enough to imply Born’s rule thus leaving room for a dispersion-free probability measure, i.e., one that has only values 0 and 1. To strengthen Gleason’s axioms one must add at least one more assumption. But, as it is argued in the present paper, alternatively one can give up the lattice condition lying in the foundation of Gleason’s theorem. Particularly, the lattice structure based on the closed linear subspaces in the Hilbert space could be weakened by the requirement for the meet operation to exist only for the subspaces belonging to commutable projection operators. The paper demonstrates that this weakening can resolve the problem of the dispersion-free probability measure in the case of a qubit.

KW - Closed subspaces

KW - Lattice structures

KW - Probability measures

KW - Quantum mechanics

UR - http://www.scopus.com/inward/record.url?scp=85091755453&partnerID=8YFLogxK

U2 - 10.1007/s40509-018-0178-6

DO - 10.1007/s40509-018-0178-6

M3 - Article

AN - SCOPUS:85091755453

VL - 6

SP - 211

EP - 216

JO - Quantum Studies: Mathematics and Foundations

JF - Quantum Studies: Mathematics and Foundations

SN - 2196-5609

IS - 2

ER -