Many-particle entanglement with Bose-Einstein condensates
Many-particle entanglement with Bose-Einstein condensates
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DOI：
10.1038/35051038
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发表时间：
2001-01-04
期刊：
影响因子：
64.8
通讯作者：
Zoller, P
中科院分区：
文献类型：
--
作者：
Sorensen, A;Duan, LM;Zoller, P
创建和操纵多粒子系统纠缠态的可能性对于量子信息处理具有重要意义;这种能力可能导致依赖于量子力学基本原理的新应用。到目前为止，已经有多达四个原子以受控的方式纠缠在一起（2，3）。产生纠缠态的一个关键要求是它们在单粒子水平上可以被认为是纯的。玻色-爱因斯坦凝聚（4-6）满足了这个要求;因此，研究它们是否也可以用于量子信息的某些应用是很自然的。在这里，我们提出了一种方法来实现大量的原子在玻色-爱因斯坦凝聚体的实质纠缠。一个单一的共振激光脉冲被施加到凝聚体中的所有原子上，然后让凝聚体自由演化;在后一阶段，碰撞相互作用在原子之间产生纠缠。该技术应该是可实现的与目前的技术。
The possibility of creating and manipulating entangled states of systems of many particles is of significant interest for quantum information processing; such a capability could lead to new applications that rely on the basic principles of quantum mechanics(1). So far, up to four atoms have been entangled in a controlled way(2,3). A crucial requirement for the production of entangled states is that they can be considered pure at the single-particle level. Bose-Einstein condensates(4-6) fulfil this requirement; hence it is natural to investigate whether they can also be used in some applications of quantum information. Here we propose a method to achieve substantial entanglement of a large number of atoms in a Bose-Einstein condensate. A single resonant laser pulse is applied to all the atoms in the condensate, which is then allowed to evolve freely; in this latter stage, collisional interactions produce entanglement between the atoms. The technique should be realizable with present technology.