Avoiding entanglement sudden-death via measurement feedback control in a quantum network
Abstract
In this paper, we consider a linear quantum network composed of two distantly separated cavities that are connected via a one-way optical field. When one of the cavity is damped and the other is undamped, the overall cavity state obtains a large amount of entanglement in its quadratures. This entanglement however immediately decays and vanishes in a finite time. That is, entanglement sudden-death occurs. We show that the direct measurement feedback method proposed by Wiseman can avoid this entanglement sudden-death, and further, enhance the entanglement. It is also shown that the entangled state under feedback control is robust against signal loss in a realistic detector, indicating the reliability of the proposed direct feedback method in practical situations.
Keywords
Cite
@article{arxiv.0806.4754,
title = {Avoiding entanglement sudden-death via measurement feedback control in a quantum network},
author = {Naoki Yamamoto and Hendra I. Nurdin and Matthew R. James and Ian R. Petersen},
journal= {arXiv preprint arXiv:0806.4754},
year = {2008}
}
Comments
11 pages