Quantum phase slips represent a coherent mechanism to couple flux states of a superconducting loop. Since their first direct observation, there have been substantial developments in building charge-insensitive quantum phase-slip circuits. At the heart of these devices is a weak link, often a nanowire, interrupting a superconducting loop. Owing to the very small cross-sectional area of such a nanowire, quantum phase slip rates in the gigahertz range can be achieved. Instead, here we present the use of a bias voltage across a superconducting loop to electrostatically induce a weak link, thereby amplifying the rate of quantum phase slips without physically interrupting the loop. Our simulations reveal that the bias voltage modulates the free energy barrier between subsequent flux states in a very controllable fashion, providing a route towards a phase-slip flux qubit with a broadly tunable transition frequency.

中文翻译：

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电压偏置超导环中的电子可调量子相位滑移，作为相位滑移磁通量比特的基础

量子相移代表了耦合超导环路通量状态的相干机制。自从他们的首次直接观察以来，在构建电荷不敏感的量子相位滑移电路方面已有了长足的发展。这些设备的核心是一条薄弱的环节，通常是一条纳米线，中断了超导回路。由于这种纳米线的横截面积非常小，因此可以实现千兆赫兹范围内的量子相滑移率。取而代之的是，在这里，我们介绍了在超导环路上使用偏置电压来静电感应弱连接，从而在不物理中断环路的情况下放大量子相位滑移的速率。我们的仿真表明，偏置电压以非常可控的方式调节了后续磁通状态之间的自由能垒，