论文标题
超导量子干扰晶体管中的超线磁通量转换率
Ultra linear magnetic flux-to-voltage conversion in superconducting quantum interference proximity transistors
论文作者
论文摘要
超导干涉仪是量子设备，能够以极好的敏感性，可集成性和功耗将磁通量转换为电输出。然而，它们的电压响应本质上是非线性的，这是通过引入补偿电感或通过构建复杂设备阵列来规避的限制。在这里，我们提出了一种基于超导量子干扰接近晶体管作为基本构建块的超导量子干扰接近晶体管的本质上线性通量到电压的介质传感器。 The bi-SQUIPT provides a voltage-noise spectral density as low as $\sim10^{-16}$ V/Hz$^{1/2}$ and, more interestingly, under a proper operation parameter selection, exhibits a spur-free dynamic range as large as $\sim60$ dB, a value on par with that obtained with state-of-the-art SQUID-based linear flux-to-voltage superconducting传感器。此外，由于其特殊的测量构型，Bi-squipp耐受性和非理想性。由于上述原因，我们认为BI-Squipp可以在低衰减和低噪声电流放大领域提供相关的阶梯，并特别强调在低温量子电子中的应用。
Superconducting interferometers are quantum devices able to transduce a magnetic flux into an electrical output with excellent sensitivity, integrability and power consumption. Yet, their voltage response is intrinsically non-linear, a limitation which is conventionally circumvented through the introduction of compensation inductances or by the construction of complex device arrays. Here we propose an intrinsically-linear flux-to-voltage mesoscopic transducer, called bi-SQUIPT, based on the superconducting quantum interference proximity transistor as fundamental building block. The bi-SQUIPT provides a voltage-noise spectral density as low as $\sim10^{-16}$ V/Hz$^{1/2}$ and, more interestingly, under a proper operation parameter selection, exhibits a spur-free dynamic range as large as $\sim60$ dB, a value on par with that obtained with state-of-the-art SQUID-based linear flux-to-voltage superconducting transducers. Furthermore, thanks to its peculiar measurement configuration, the bi-SQUIPT is tolerant to imperfections and non-idealities in general. For the above reasons, we believe that the bi-SQUIPT could provide a relevant step-beyond in the field of low-dissipation and low-noise current amplification with a special emphasis on applications in cryogenic quantum electronics.
