论文标题
双量子点中的三胞胎障碍物约瑟夫森超流
Triplet-blockaded Josephson supercurrent in double quantum dots
论文作者
论文摘要
在半导体纳米结构中产生的串行双重量子点为研究两电子自旋量子状态提供了一种多功能平台，可以通过静电门控和外部磁场来调整。在这项工作中，我们直接测量了Inas纳米纳维尔双量子点的相邻电荷状态之间的超电流逆转，并与理论模型很好地吻合。在偶数电荷平价领域中，我们观察到具有增加磁场的超电流阻滞，对应于旋转单线到三重态转变。我们的结果表明，直接旋转到超电流转化率，这是Pauli自旋封锁的超导。可以在与自旋系统和超导电路的量子状态结合的杂交量子体系结构中利用这种效果。
Serial double quantum dots created in semiconductor nanostructures provide a versatile platform for investigating two-electron spin quantum states, which can be tuned by electrostatic gating and an external magnetic field. In this work, we directly measure the supercurrent reversal between adjacent charge states of an InAs nanowire double quantum dot with superconducting leads, in good agreement with theoretical models. In the even charge parity sector, we observe a supercurrent blockade with increasing magnetic field, corresponding to the spin singlet to triplet transition. Our results demonstrate a direct spin to supercurrent conversion, the superconducting equivalent of the Pauli spin blockade. This effect can be exploited in hybrid quantum architectures coupling the quantum states of spin systems and superconducting circuits.
