Coupling Two Distant Double Quantum Dots with a Microwave Resonator

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• 作者：Guang-Wei Deng ; Da Wei ; Shu-Xiao Li ; J. R. Johansson ; Wei-Cheng Kong ; Hai-Ou Li ; Gang Cao ; Ming Xiao ; Guang-Can Guo ; Franco Nori ; Hong-Wen Jiang ; Guo-Ping Guo
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：15
• 期：10
• 页码：6620-6625
• 全文大小：488K
• ISSN：1530-6992

文摘

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鈥揅ummings (T鈥揅) 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鈥揅 physics in electronic transport and also contribute to the study of nonlocal transport and future implementations of remote electronic entanglement.