Voltage-controlled superconducting quantum bus
Voltage-controlled superconducting quantum bus
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DOI：
10.1103/physrevb.99.085434
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发表时间：
2019-02-21
影响因子：
3.7
通讯作者：
Marcus, C. M.
中科院分区：
文献类型：
--
作者：
Casparis, L.;Pearson, N. J.;Marcus, C. M.
我们展示了外延超导体纳米线作为场效应开关来调谐超导腔的能力。两个超导门子量子比特耦合到腔体，腔体充当量子总线。使用栅极电压来控制超导开关在接通和关断状态之间的量子位-量子位耦合中产生高达8倍的变化，而不会对量子位相干性产生不利影响。耦合开关在纳秒时间尺度上的高带宽操作会降低量子比特的相干性。
We demonstrate the ability of an epitaxial semiconductor-superconductor nanowire to serve as a field-effect switch to tune a superconducting cavity. Two superconducting gatemon qubits are coupled to the cavity, which acts as a quantum bus. Using a gate voltage to control the superconducting switch yields up to a factor of 8 change in qubit-qubit coupling between the on and off states without detrimental effect on qubit coherence. High-bandwidth operation of the coupling switch on nanosecond time scales degrades qubit coherence.