Probing Energy Spectrum of Quadruple Quantum Dots with Microwave Field

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2014,（5）
• 页码范围: 5-8
• 页数: 4页
• 语种: 中文
• DOI: 10.1088/0256-307X/31/5/050302

摘要

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.