The quantum Allan variance
Quantum Physics
2016-08-30 v2
Abstract
The instability of an atomic clock is characterized by the Allan variance, a measure widely used to describe the noise of frequency standards. We provide an explicit method to find the ultimate bound on the Allan variance of an atomic clock in the most general scenario where N atoms are prepared in an arbitrarily entangled state and arbitrary measurement and feedback are allowed, including those exploiting coherences between succeeding interrogation steps. While the method is rigorous and general, it becomes numerically challenging for large N and long averaging times.
Cite
@article{arxiv.1601.01685,
title = {The quantum Allan variance},
author = {Krzysztof Chabuda and Ian Leroux and Rafal Demkowicz-Dobrzanski},
journal= {arXiv preprint arXiv:1601.01685},
year = {2016}
}
Comments
17 pages, 2 figures