论文标题
INAS双量子点中相干电流峰的温度依赖性扩大
Temperature-dependent broadening of coherent current peaks in InAs double quantum dots
论文作者
论文摘要
如今，用于量子计算或量子传感的量子系统通常在固态设备中经常实现，例如复杂的约瑟夫森电路或耦合量子点系统。凝结物作为环境对这种系统的量子相干性影响。在这里，我们通过不对称耦合的INAS双量子点研究电子传输，并观察到单电子隧穿的相干电流峰的温度依赖性极高。我们从实验和理论上分析了这种相干电流峰至20 K的温度，我们能够以量子耗散的形式对其进行建模，这是由于两个不同的骨浴所引起的。这些骨浴主要起源于底物声子。磁场的应用有助于我们通过其温度依赖性来识别不同的量子点状态。
Quantum systems as used for quantum computation or quantum sensing are nowadays often realized in solid state devices as e.g. complex Josephson circuits or coupled quantum-dot systems. Condensed matter as an environment influences heavily the quantum coherence of such systems. Here, we investigate electron transport through asymmetrically coupled InAs double quantum dots and observe an extremely strong temperature dependence of the coherent current peaks of single-electron tunneling. We analyze experimentally and theoretically the broadening of such coherent current peaks up to temperatures of 20 K and we are able to model it with quantum dissipation being due to two different bosonic baths. These bosonic baths mainly originate from substrate phonons. Application of a magnetic field helps us to identify the different quantum dot states through their temperature dependence.
