Thermal budget of superconducting digital circuits at subkelvin temperatures
Thermal budget of superconducting digital circuits at subkelvin temperatures
复制标题
亚开尔文温度下超导数字电路的热预算
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
V. Semenov
中科院分区：
文献类型：
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作者：
A. Savin;J. Pekola;D. Averin;V. Semenov
超导单通量量子（SFQ）电路到目前为止已经开发并优化了在氦温度或更高温度下运行的电路。然而，SFQ方法也应该为约瑟夫森结量子比特和其他工作温度低得多（毫开尔文）的应用提供潜在可行和可扩展的控制和读出电路。本文分析了在此温度范围内的过热问题。我们提出了一个亚开尔文温度下SFQ电路的热模型，并给出了支持该模型的电子和硅衬底过热的实验结果。该模型对电阻器中的“局部”电子过热和由于沿衬底传播的弹道声子引起的“全局”过热的耗散功率建立了定量限制。还讨论了SFQ电路在过热问题下可能发生的热设计变化。
Superconducting single-flux-quantum (SFQ) circuits have so far been developed and optimized for operation at or above helium temperatures. The SFQ approach, however, should also provide potentially viable and scalable control and readout circuits for Josephson-junction qubits and other applications with much lower, millikelvin, operating temperatures. This paper analyzes the overheating problem which becomes important in this temperature range. We suggest a thermal model of the SFQ circuits at subkelvin temperatures and present experimental results on overheating of electrons and silicon substrate which support this model. The model establishes quantitative limitations on the dissipated power both for “local” electron overheating in resistors and “global” overheating due to ballistic phonon propagation along the substrate. Possible changes in the thermal design of SFQ circuits in view of the overheating problem are also discussed.