Preparation of Knill-Laflamme-Milburn states using tunable controlled phase gate
Abstract
A specific class of partially entangled states known as Knill-Laflamme-Milburn states (or KLM states) has been proved to be useful in relation to quantum information processing [Knill et al., Nature 409, 46 (2001)]. Although the usage of such states is widely investigated, considerably less effort has been invested into experimentally accessible preparation schemes. This paper discusses the possibility to employ a tunable controlled phase gate to generate an arbitrary Knill-Laflamme-Milburn state. In the first part, the idea of using the controlled phase gate is explained on the case of two-qubit KLM states. Optimization of the proposed scheme is then discussed for the framework of linear optics. Subsequent generalization of the scheme to arbitrary n-qubit KLM state is derived in the second part of this paper.
Keywords
Cite
@article{arxiv.1108.1006,
title = {Preparation of Knill-Laflamme-Milburn states using tunable controlled phase gate},
author = {Karel Lemr},
journal= {arXiv preprint arXiv:1108.1006},
year = {2011}
}
Comments
5 pages, 4 figures, accepted in Journal of Physics B