Josephson Metamaterial with a Widely Tunable Positive or Negative Kerr Constant
Josephson Metamaterial with a Widely Tunable Positive or Negative Kerr Constant
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DOI：
10.1103/physrevapplied.8.051001
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发表时间：
2017-07
影响因子：
4.6
通讯作者：
Wenyuan Zhang;W. Huang;M. Gershenson;M. Bell
中科院分区：
文献类型：
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作者：
Wenyuan Zhang;W. Huang;M. Gershenson;M. Bell
我们报道了一种新的一维约瑟夫森超材料的微波表征，该材料由一链非对称超导量子干涉器件（squid）组成，通过共同约瑟夫森结具有最近邻耦合。这种超材料表现出很强的克尔非线性，克尔常数可以通过穿过squid的磁通量在很宽的范围内从正到负值进行调节。实验结果与约瑟夫森链非线性效应理论吻合较好。超材料作为约瑟夫森行波参量放大器的有源介质是非常有前途的；它的使用有助于在四波混频过程中进行相位匹配，从而获得有效的参数增益。
We report on the microwave characterization of a novel one-dimensional Josephson metamaterial composed of a chain of asymmetric superconducting quantum interference devices (SQUIDs) with nearest-neighbor coupling through common Josephson junctions. This metamaterial demonstrates a strong Kerr nonlinearity, with a Kerr constant tunable over a wide range, from positive to negative values, by a magnetic flux threading the SQUIDs. The experimental results are in good agreement with the theory of nonlinear effects in Josephson chains. The metamaterial is very promising as an active medium for Josephson traveling-wave parametric amplifiers; its use facilitates phase matching in a four-wave mixing process for efficient parametric gain.