Quantum measurement of a mesoscopic spin ensemble
Quantum Physics
2009-11-11 v3 Mesoscale and Nanoscale Physics
Abstract
We describe a method for precise estimation of the polarization of a mesoscopic spin ensemble by using its coupling to a single two-level system. Our approach requires a minimal number of measurements on the two-level system for a given measurement precision. We consider the application of this method to the case of nuclear spin ensemble defined by a single electron-charged quantum dot: we show that decreasing the electron spin dephasing due to nuclei and increasing the fidelity of nuclear-spin-based quantum memory could be within the reach of present day experiments.
Cite
@article{arxiv.quant-ph/0508144,
title = {Quantum measurement of a mesoscopic spin ensemble},
author = {G. Giedke and J. M. Taylor and D. D'Alessandro and M. D. Lukin and A. Imamoglu},
journal= {arXiv preprint arXiv:quant-ph/0508144},
year = {2009}
}
Comments
8 pages, 2 figures; minor changes, published version