用微波谐振器耦合两个遥远的双量子点。

Coupling Two Distant Double Quantum Dots with a Microwave Resonator.

机构信息

Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences , Hefei 230026, China.

Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China.

出版信息

Nano Lett. 2015 Oct 14;15(10):6620-5. doi: 10.1021/acs.nanolett.5b02400. Epub 2015 Sep 2.

DOI:10.1021/acs.nanolett.5b02400

PMID:26327140

Abstract

We fabricated a hybrid device with two distant graphene double quantum dots (DQDs) and a microwave resonator. A nonlinear response is observed in the resonator reflection amplitude when the two DQDs are jointly tuned to the vicinity of the degeneracy points. This observation can be well fitted by the Tavis-Cummings (T-C) model which describes two two-level systems coupling with one photonic field. Furthermore, the correlation between the DC currents in the two DQDs is studied. A nonzero cross-current correlation is observed which has been theoretically predicted to be an important sign of nonlocal coupling between two distant systems. Our results explore T-C physics in electronic transport and also contribute to the study of nonlocal transport and future implementations of remote electronic entanglement.

摘要

我们制作了一个具有两个远距离石墨烯双量子点（DQD）和一个微波谐振器的混合器件。当两个 DQD 被共同调谐到简并点附近时，在谐振器反射幅度中观察到非线性响应。这种观察可以通过描述两个与一个光子场耦合的两个能级系统的 Tavis-Cummings（T-C）模型很好地拟合。此外，还研究了两个 DQD 中的直流电流之间的相关性。观察到非零交叉电流相关性，这已被理论预测为两个远距离系统之间非局部耦合的重要标志。我们的结果探索了电子输运中的 T-C 物理，也为非局域输运和未来远程电子纠缠的实现做出了贡献。