



01191nas a2200145   4500008004100000245007100041210006900112260001400181300001600195490000700211520075200218100001900970700001900989856003701008       2008                        eng d00aEfficient scheme for one-way quantum computing in thermal cavities0 aEfficient scheme for oneway quantum computing in thermal cavitie  c2008/4/12  a2997 - 30040 v473 a  We propose a practical scheme for one-way quantum computing based on
efficient generation of 2D cluster state in thermal cavities. We achieve a
controlled-phase gate that is neither sensitive to cavity decay nor to thermal
field by adding a strong classical field to the two-level atoms. We show that a
2D cluster state can be generated directly by making every two atoms collide in
an array of cavities, with numerically calculated parameters and appropriate
operation sequence that can be easily achieved in practical Cavity QED
experiments. Based on a generated cluster state in Box$^{(4)}$ configuration,
we then implement Grover's search algorithm for four database elements in a
very simple way as an example of one-way quantum computing.
1 aYang, Wen-Xing1 aGong, Zhe-Xuan  uhttp://arxiv.org/abs/0704.2297v1