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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
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| Cite this article: |
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SHANG Ru-Nan, LI Hai-Ou, CAO Gang et al 2014 Chin. Phys. Lett. 31 050302 |
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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.
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Published: 24 April 2014
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| PACS: |
03.67.-a
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(Quantum information)
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03.67.Ac
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(Quantum algorithms, protocols, and simulations)
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03.67.Bg
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(Entanglement production and manipulation)
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