Probing Energy Spectrum of Quadruple Quantum Dots with Microwave Field
SHANG Ru-Nan, LI Hai-Ou, CAO Gang, YU Guo-Dong, XIAO Ming, TU Tao, GUO Guo-Ping**
Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026
Abstract ：A double quantum dot defines a qubit by a two-level system. The coupling between two qubits induces a double two-level system into a four-level system. We study experimentally the coupling between two capacitive coupled GaAs/AlGaAs double quantum dots while tuning the energy detuning of each double quantum dot simultaneously. Applying microwave photons (at a frequency of 20 GHz) on this system and observing the resonance tunneling with a quantum point contact detector, we obtain an excitation spectrum which is consistent with the numerical simulation result of a coupled two-qubit Hamiltonian. This study demonstrates that a double quantum dot can be exploited as an extraordinary platform for controlled quantum gates.
出版日期: 2014-04-24
:
03.67.-a
(Quantum information)
03.67.Ac
(Quantum algorithms, protocols, and simulations)
03.67.Bg
(Entanglement production and manipulation)
引用本文:
. [J]. 中国物理快报, 2014, 31(05): 50302-050302.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/31/5/050302
或
https://cpl.iphy.ac.cn/CN/Y2014/V31/I05/50302
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2014, Vol. 31 
