Weber Joel C, Fowler Joseph W, Durkin Malcolm, Morgan Kelsey M, Mates John A B, Bennett Doug A, Doriese W Bertrand, Schmidt Daniel R, Hilton Gene C, Swetz Daniel S, Ullom Joel N
National Institute of Standards and Technology, Boulder, Colorado 80305, USA.
Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.
Appl Phys Lett. 2019;114(23). doi: 10.1063/1.5089870.
The development of a superconducting analog to the transistor with extremely low power dissipation will accelerate the proliferation of low-temperature circuitry operating in the milliKelvin regime. The thin-film, magnetically actuated cryotron switch is a candidate building block for more complicated and flexible milliKelvin circuitry. We demonstrate its utility for implementing reconfigurable circuitry by integrating a cryotron switch into flux-summed code-division SQUID multiplexed readout for large arrays of transition-edge-sensor (TES) microcalorimeters. Code-division multiplexing eliminates the noise penalty of time-division multiplexing while being drop-in compatible with the latter's control electronics. However, code-division multiplexing is susceptible to single-point failure mechanisms which can result in an unconstrained demodulation matrix and the loss of information from many sensing elements. In the event of a failure, the integrated cryotron switch provides a zero-signal output from a single TES, enabling the demodulation matrix used to compute TES signals from SQUID signals to be constrained and data recovered from the remaining sensors. This demonstration of configurable error correction provides both a realworld application of the cryotron switch and a foundation for more complex circuitry at milliKelvin temperatures.
开发具有极低功耗的超导晶体管类似物将加速在毫开尔文温度范围内运行的低温电路的普及。薄膜磁驱动低温管开关是构建更复杂、更灵活的毫开尔文电路的候选组件。我们通过将低温管开关集成到用于大量过渡边缘传感器（TES）微热量计的磁通和码分超导量子干涉装置（SQUID）多路复用读出中，展示了其在实现可重构电路方面的实用性。码分复用消除了时分复用的噪声代价，同时与后者的控制电子设备完全兼容。然而，码分复用容易受到单点故障机制的影响，这可能导致解调矩阵不受约束，以及许多传感元件的信息丢失。在发生故障时，集成的低温管开关从单个TES提供零信号输出，使得用于从SQUID信号计算TES信号的解调矩阵受到约束，并从其余传感器恢复数据。这种可配置纠错的演示既为低温管开关提供了实际应用，也为毫开尔文温度下更复杂的电路奠定了基础。
