Adiabatic quantum search scheme with atoms in a cavity driven by lasers.
Adiabatic quantum search scheme with atoms in a cavity driven by lasers.
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DOI：
10.1103/physrevlett.99.170503
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发表时间：
2007-07
影响因子：
8.6
通讯作者：
D. Daems;Stéphane Guérin
中科院分区：
文献类型：
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作者：
D. Daems;Stéphane Guérin
提出了一种在腔-激光-原子系统中通过绝热通道实现对N个无序列表中有标记项的量子搜索算法。我们使用了一个由N个完全相同的三能级原子组成的系综，这些原子被囚禁在一个单模腔中，并由两个激光器驱动。在每个原子中，相同的级别代表一个数据库条目。其中一个原子的两个基态之间有能隙。两个激光脉冲之间的适当时间延迟允许一个人在无消相干的绝热子空间内从初始纠缠态开始填充标记状态。实现这一过程的时间显示出平方根N格罗弗加速比。
We propose an implementation of the quantum search algorithm of a marked item in an unsorted list of N items by adiabatic passage in a cavity-laser-atom system. We use an ensemble of N identical three-level atoms trapped in a single-mode cavity and driven by two lasers. In each atom, the same level represents a database entry. One of the atoms is marked by having an energy gap between its two ground states. Appropriate time delays between the two laser pulses allow one to populate the marked state starting from an initial entangled state within a decoherence-free adiabatic subspace. The time to achieve such a process is shown to exhibit the square root N Grover speedup.