Probing Energy Spectrum of Quadruple Quantum Dots with Microwave Field
Probing Energy Spectrum of Quadruple Quantum Dots with Microwave Field
复制标题
DOI：
10.1088/0256-307x/31/5/050302
复制
发表时间：
2014-04
影响因子：
3.5
通讯作者：
Runan Shang;Haiou Li;G. Cao;G. Yu;M. Xiao;T. Tu;G. Guo
中科院分区：
文献类型：
--
作者：
Runan Shang;Haiou Li;G. Cao;G. Yu;M. Xiao;T. Tu;G. Guo
双量子点通过两级系统定义量子位。两个量子比特之间的耦合将双二能级系统诱导为四能级系统。实验研究了两个电容耦合GaAs/AlGaAs双量子点之间的耦合，同时对每个双量子点的能量失谐进行了调谐。将频率为20 GHz的微波光子施加到该系统上，用量子点接触探测器观察了共振隧道，得到了与耦合双量子比特哈密顿量的数值模拟结果一致的激发谱。该研究表明，双量子点可以作为受控量子门的非凡平台。
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.