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arXiv 1405.3085cond-mat.mes-hall
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电路量子电动力学体系中作用于半导体量子点的电荷噪声的计算

Evaluating charge noise acting on semiconductor quantum dots in the circuit quantum electrodynamics architecture

Julien Basset, Anna Stockklauser, David-Dominik Jarausch, Tobias Frey, Christian Reichl, Werner Wegscheider, Andreas Wallraff, Klaus Ensslin, Thomas Ihn

摘要:

本文研究了GaAs/GaAlAs基半导体双量子点偶极耦合超导传输线谐振器电压振荡时的电荷噪声。通过谐振器传输的微波音调的同相($I$)和正交($Q$)分量对双点周围环境中的充电事件敏感,最佳灵敏度为$8.5\times10^{-5} \mbox{e}/\sqrt{\mbox{Hz}}$。一个低频$1/f$型噪声谱结合的白噪声水平的$6.6\times10^{-6}$ $\mbox{e}^2/\mbox{Hz}$以上$1$ Hz提取,与以前的结果与量子点接触电荷探测器上类似的异质结构。$1/f$噪声的斜率允许提取双点电荷量子比特退相速率的下限,我们将其与从Jaynes-Cummings Hamilton方法提取的下限进行比较。发现这两个速率是相似的,强调电荷噪声是我们系统中失相的主要来源。

英文摘要:

We evaluate the charge noise acting on a GaAs/GaAlAs based semiconductor double quantum dot dipole-coupled to the voltage oscillations of a superconducting transmission line resonator. The in-phase ($I$) and the quadrature ($Q$) components of the microwave tone transmitted through the resonator are sensitive to charging events in the surrounding environment of the double dot with an optimum sensitivity of $8.5\times10^{-5} \mbox{e}/\sqrt{\mbox{Hz}}$. A low frequency $1/f$ type noise spectrum combined with a white noise level of $6.6\times10^{-6}$ $\mbox{e}^2/\mbox{Hz}$ above $1$ Hz is extracted, consistent with previous results obtained with quantum point contact charge detectors on similar heterostructures. The slope of the $1/f$ noise allows to extract a lower bound for the double-dot charge qubit dephasing rate which we compare to the one extracted from a Jaynes-Cummings Hamiltonian approach. The two rates are found to be similar emphasizing that charge noise is the main source of dephasing in our system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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