【摘 要】
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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 e
【机 构】
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Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026
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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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