论文标题
在Transmon电路中检测到的量子点Josephson结的量子doblet跃迁
Singlet-doublet transitions of a quantum dot Josephson junction detected in a transmon circuit
论文作者
论文摘要
我们意识到了混合超导体 - 触发器透射器设备，其中约瑟夫森效应由INAS/AL纳米线中的栅极定义的量子点控制。 Transmon过渡光谱的微波光谱使我们能够探测量子点的基态均衡，这是栅极电压，外部磁通量和平行于纳米线施加的磁场的函数。测得的奇偶校验相图与具有超导导线的单个障碍物模型所预测的相一致。通过对电路的连续时间监测，我们进一步解决了量子点在整个相边界上的量子点的准粒子动力学。我们的结果可以促进基于半导体的$ 0-πbits和Andreev Qubits的实现。
We realize a hybrid superconductor-semiconductor transmon device in which the Josephson effect is controlled by a gate-defined quantum dot in an InAs/Al nanowire. Microwave spectroscopy of the transmon's transition spectrum allows us to probe the ground state parity of the quantum dot as a function of gate voltages, external magnetic flux, and magnetic field applied parallel to the nanowire. The measured parity phase diagram is in agreement with that predicted by a single-impurity Anderson model with superconducting leads. Through continuous time monitoring of the circuit we furthermore resolve the quasiparticle dynamics of the quantum dot Josephson junction across the phase boundaries. Our results can facilitate the realization of semiconductor-based $0-π$ qubits and Andreev qubits.
