Accessible information of a general quantum Gaussian ensemble
Quantum Physics
2025-09-01 v3
Abstract
Accessible information, which is a basic quantity in quantum information theory, is computed for a general quantum Gaussian ensemble under certain "threshold condition". It is shown that the maximizing measurement is Gaussian, constituting a far-reaching generalization of the optical heterodyning. This substantially extends the previous result concerning the gauge-invariant case, even for a single bosonic mode.
Cite
@article{arxiv.2102.01981,
title = {Accessible information of a general quantum Gaussian ensemble},
author = {A. S. Holevo},
journal= {arXiv preprint arXiv:2102.01981},
year = {2025}
}
Comments
18 pages, 1 figure, notations improved. In the single mode case a new ex[licit form of the threshold condition is given