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Effect of different coupling modes on the high-frequency response of YBCO microwave SQUIDs

机译:不同耦合方式对YBCO微波SQUID高频响应的影响

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Abstract: The effect of microwave and dc magnetic fields on the unloaded quality factor and the resonant frequency of two differently coupled hysteretic 3 GHz microwave SQUIDs was investigated. The SQUID loops are integrated into and solely inductively coupled to the superconducting resonator, respectively. The dissipative and the reactive response are analyzed in terms of a phenomenological model by Silver and Zimmerman. The temperature dependencies of the threshold field for microwave induced quantum transitions and of the coupling strength between SQUID ring and resonator are discussed. Conditions for optimized operation are deduced for both samples. The results indicate that it is possible to reduce the coupling coefficient, k$+2$/, by a suitable loop design while maintaining, at a reduced temperature, a sufficiently large dc field induced variation of the microwave losses (transfer function). !16
机译:摘要:研究了微波和直流磁场对两种不同耦合的迟滞3 GHz微波SQUID的空载品质因数和谐振频率的影响。 SQUID回路分别集成到超导谐振器中并单独感应耦合到超导谐振器。 Silver和Zimmerman根据现象学模型分析了耗散和反应性响应。讨论了微波诱导的量子跃迁的阈值场与SQUID环与谐振器之间的耦合强度的温度依赖性。得出两个样品的最佳操作条件。结果表明,可以通过适当的环路设计来减小耦合系数k $ + 2 $ /,同时在降低的温度下保持足够大的直流磁场引起的微波损耗变化(传递函数)。 !16

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