平面锗中强电光耦合得益于颗粒铝超电感器
Strong Charge-Photon Coupling in Planar Germanium Enabled by Granular Aluminium Superinductors
AI总结：
通过颗粒铝超电感器与锗双量子点结合，实现了强电光耦合，展示了高阻抗超导体在量子器件中的应用潜力。
摘要：
高动能电感超导体在实现量子比特、放大器和探测器方面日益受到关注。此外，得益于其高阻抗，由此类材料制成的量子总线能够产生大的零点波动，从而增强与自旋和电荷量子比特的耦合率。然而，充分利用无序或颗粒超导体的潜力具有挑战性，因为其电感和因此的阻抗在高频下难以控制。在此，我们集成了一个具有特征阻抗超过电阻量子的颗粒铝谐振器，与锗双量子点结合，展示了强电光耦合，耦合率为$g_\text{c}/2π= (566 \pm 2)$ MHz。这归功于实现了一种无线欧姆计，允许在薄膜沉积过程中进行原位测量，从而控制颗粒铝薄膜的动能电感。现在可以重复制造具有阻抗（电感）超过13 k$Ω$（每平方1 nH）的电路。这种方法具有广泛的应用前景，为新型量子比特和高保真度、长距离的双量子比特门提供了可能。
英文摘要：
High kinetic inductance superconductors are gaining increasing interest for the realisation of qubits, amplifiers and detectors. Moreover, thanks to their high impedance, quantum buses made of such materials enable large zero-point fluctuations of the voltage, boosting the coupling rates to spin and charge qubits. However, fully exploiting the potential of disordered or granular superconductors is challenging, as their inductance and, therefore, impedance at high values are difficult to control. Here we have integrated a granular aluminium resonator, having a characteristic impedance exceeding the resistance quantum, with a germanium double quantum dot and demonstrate strong charge-photon coupling with a rate of $g_\text{c}/2π= (566 \pm 2)$ MHz. This was achieved due to the realisation of a wireless ohmmeter, which allows \emph{in situ} measurements during film deposition and, therefore, control of the kinetic inductance of granular aluminium films. Reproducible fabrication of circuits with impedances (inductances) exceeding 13 k$Ω$ (1 nH per square) is now possible. This broadly applicable method opens the path for novel qubits and high-fidelity, long-distance two-qubit gates.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
