用于低温应用的超导磁通存储器
Superconducting Flux Memory for Cryogenic Applications
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中文总结 AI 辅助
该研究研发了三种用于超导电路的低温超导磁通存储器，通过实验验证其可提供稳定磁通偏置、减少控制线数量，还实现了传输子量子比特的稳定偏置，为其应用奠定基础。
中文摘要 AI 辅助
我们报告了适用于超导电路的磁通存储器的研发情况。该技术将持续电流存储在片上超导环路中，用于为量子比特等超导电路提供磁通偏置。我们研发了三种类型的磁通存储器，并针对电路设计对它们进行了比较。我们通过使用原位磁通检测器证明了磁通存储器的实用性，对每种方法进行了表征，还进一步证明，一旦在存储单元中设置好磁通，台式直流控制源即可关闭，片上磁通偏置会保持在位。我们提出，磁通存储器可布置成二维结构，以复用控制信号并减少线路数量的缩放（N²个器件→2N条控制线），我们的实验结果为所提出的可扩展性铺平了道路。我们演示了利用磁通存储器对传输子量子比特进行磁通偏置，证明量子比特状态可被调谐至目标频率，且该频率在片上保持稳定达20小时。
英文摘要
We report the development of flux memory for use with superconducting circuits. This technology stores persistent currents in superconducting loops on-chip to be used to provide flux biasing for superconducting circuits, like qubits. We developed three types of flux memory and draw comparisons among them for circuit design. We demonstrate the utility of flux memory by using an in-situ flux detector and characterize each approach and further demonstrate that once flux is set in a memory cell, benchtop DC control sources can be powered off, leaving the on-chip flux bias in place. We propose that flux memory can be arranged in a two-dimensional configuration to multiplex control signals and reduce how line counts scale (N^2 devices -> 2N control lines), and our experimental results pave the path to the proposed scalability. We demonstrate the use of flux memory to flux bias a transmon qubit and show the tunability of the qubit state to a target frequency which remained stable on-chip for 20 hours.
发表机构
- Northrop Grumman Systems Corporation（诺斯罗普·格鲁曼系统公司）
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