Tightening Quantum Speed Limits for Almost All States
Quantum Physics
2018-02-14 v2
Abstract
Conventional quantum speed limits perform poorly for mixed quantum states: They are generally not tight and often significantly underestimate the fastest possible evolution speed. To remedy this, for unitary driving, we derive two quantum speed limits that outperform the traditional bounds for almost all quantum states. Moreover, our bounds are significantly simpler to compute as well as experimentally more accessible. Our bounds have a clear geometric interpretation; they arise from the evaluation of the angle between generalized Bloch vectors.
Cite
@article{arxiv.1709.08941,
title = {Tightening Quantum Speed Limits for Almost All States},
author = {Francesco Campaioli and Felix A. Pollock and Felix C. Binder and Kavan Modi},
journal= {arXiv preprint arXiv:1709.08941},
year = {2018}
}
Comments
Updated and revised version; 5 pages, 2 figures, 1 page appendix