Bosonic Josephson junction controlled by a single trapped ion.
Bosonic Josephson junction controlled by a single trapped ion.
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由单个捕获离子控制的玻色约瑟夫森结
DOI：
10.1103/physrevlett.109.080402
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发表时间：
2012
影响因子：
8.6
通讯作者：
F. Schmidt-Kaler
中科院分区：
文献类型：
--
作者：
R. Gerritsma;A. Negretti;H. Doerk;Z. Idziaszek;T. Calarco;F. Schmidt-Kaler
本文从理论上研究了双阱玻色约瑟夫森结与单个囚禁离子的耦合特性。我们发现威尔斯阱之间的耦合可以通过离子的内态来控制，这可以用来研究两个系统之间的介观纠缠，并高精度地测量它们之间的相互作用。作为一个特殊的例子，我们考虑一个单原子和一个小玻色-爱因斯坦凝聚控制的单离子。我们计算井间耦合率达到数百赫兹，而状态的依赖性相当于几十赫兹的合理值，目前未知的波之间的原子和离子的散射长度。分析表明，它是可能的诱导自陷或隧穿制度，这取决于离子的内部状态。这使得能够在现有技术内产生大规模的离子-原子波包纠缠。
We theoretically investigate the properties of a double-well bosonic Josephson junction coupled to a single trapped ion. We find that the coupling between the wells can be controlled by the internal state of the ion, which can be used for studying mesoscopic entanglement between the two systems and to measure their interaction with high precision. As a particular example we consider a singleatom and a small Bose-Einstein condensate controlled by a singleion. We calculate interwell coupling rates reaching hundreds of Hz, while the state dependence amounts to tens of Hz for plausible values of the currently unknown-wave scattering length between the atom and the ion. The analysis shows that it is possible to induce either the self-trapping or the tunneling regime, depending on the internal state of the ion. This enables the generation of large scale ion-atomic wave packet entanglement within current technology.