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Coupling Two Distant Double Quantum Dots with a Microwave Resonator

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† 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
∥ §iTHES Research Group and ∥CEMS, RIKEN, Wako-shi, Saitama, 351-0198, Japan
⊥ Physics Department, The University of Michigan, Ann Arbor, Michigan 48109-1040, United States
# Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90095, United States
*E-mail: [email protected]
Cite this: Nano Lett. 2015, 15, 10, 6620–6625
Publication Date (Web):September 1, 2015
https://doi.org/10.1021/acs.nanolett.5b02400
Copyright © 2015 American Chemical Society
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    Abstract

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    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.

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