量子点接触中自洽束缚态的探测器反作用
Detector Backaction on the Self-Consistent Bound State in Quantum Point Contacts
摘要：
量子点接触（QPC）中的束缚态（BS）形成可以提供一种方便的方法来定位和探测单自旋。在这封信中，我们通过使用第二个QPC（通过波函数重叠耦合到BS）来监测这些BS，研究它们如何受到影响。我们表明，这种耦合导致一个独特的检测器反作用，其中BS被削弱，通过增加其接近检测器。然而，我们还表明，这种QPC之间的相互作用可以调节的意愿，通过使用一个额外的门来控制它们的波函数重叠。
英文摘要：
Bound-state (BS) formation in quantum point contacts (QPCs) may offer a convenient way to localize and probe single spins. In this letter, we investigate how such BSs are affected by monitoring them with a second QPC, which is coupled to the BS via wavefunction overlap. We show that this coupling leads to a unique detector backaction, in which the BS is weakened by increasing its proximity to the detector. We also show, however, that this interaction between the QPCs can be regulated at will, by using an additional gate to control their wavefunction overlap.
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