Coherent feedback that beats all measurement-based feedback protocols
Quantum Physics
2014-07-31 v2
Abstract
We show that when the speed of control is bounded, there is a widely applicable minimal-time control problem for which a coherent feedback protocol is optimal, and is faster than all measurement-based feedback protocols, where the latter are defined in a strict sense. The superiority of the coherent protocol is due to the fact that it can exploit a geodesic path in Hilbert space, a path that measurement-based protocols cannot follow.
Cite
@article{arxiv.1211.1724,
title = {Coherent feedback that beats all measurement-based feedback protocols},
author = {Kurt Jacobs and Xiaoting Wang and Howard M. Wiseman},
journal= {arXiv preprint arXiv:1211.1724},
year = {2014}
}
Comments
4 pages, revtex4-1, 1 png figure; v2: new (now optimal) coherent protocol, new author