Implementation of quantum search scheme by adiabatic passage in a cavity--laser--atom system |
| |
Authors: | Liu Wen-Wu Li Hong-Cai and Yang Rong-Can |
| |
Institution: | School of Physics and Optoelectronics Technology, Fujian Normal University, Fuzhou 350007, China |
| |
Abstract: | This paper proposes a scheme for implementing the adiabatic quantum
search algorithm of different marked items in an unsorted list of
N items with atoms in a cavity driven by lasers. N identical
three-level atoms are trapped in a single-mode cavity. Each atom is
driven by a set of three pulsed laser fields. In each atom, the same
level represents a database entry. Two of the atoms are marked
differently. The marked atom has an energy gap between its two
ground states. The two different marked states can be sought out
respectively starting from an initial entangled state by controlling
the ratio of three pulse amplitudes. Moreover, the mechanism, based
on adiabatic passage, constitutes a decoherence-free method in the
sense that spontaneous emission and cavity damping are avoided since
the dynamics follows the dark state. Furthermore, this paper extends
the algorithm with m (m>2) atoms marked in an ideal situation.
Any different marked state can be sought out. |
| |
Keywords: | adiabatic quantum search
algorithm cavity--laser--atom system marked state |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |
|