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• W2163564848 abstract "A Superconducting QUantum Interference Device (SQUID) modulated by a fast oscillating magnetic flux can be used as a parametric amplifier, providing gain with very little added noise. Here, we develop linearized models to describe the parametrically flux-pumped SQUID in terms of an impedance. An unpumped SQUID acts as an inductance, the Josephson inductance, whereas a flux-pumped SQUID develops an additional, parallel element which we have coined the “pumpistor.” Parametric gain can be understood as a result of a negative resistance of the pumpistor. In the degenerate case, the gain is sensitive to the relative phase between the pump and signal. In the nondegenerate case, gain is independent of this phase. We develop our models first for degenerate parametric pumping in the three-wave and four-wave cases, where the pump frequency is either twice or equal to the signal frequency, respectively. We then derive expressions for the nondegenerate case where the pump frequency is not a multiple of the signal frequency, for which it becomes necessary to consider idler tones that occur. For the nondegenerate three-wave case, we present an intuitive picture for a parametric amplifier containing a flux-pumped SQUID where current at the signal frequency depends upon the load impedance at an idler frequency. This understanding provides insight and readily testable predictions of circuits containing flux-pumped SQUIDs." @default.
• W2163564848 created "2016-06-24" @default.
• W2163564848 creator A5000836769 @default.
• W2163564848 creator A5073844805 @default.
• W2163564848 date "2014-03-07" @default.
• W2163564848 modified "2023-10-14" @default.
• W2163564848 title "Negative-resistance models for parametrically flux-pumped superconducting quantum interference devices" @default.
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• W2163564848 doi "https://doi.org/10.1140/epjqt6" @default.
• W2163564848 hasPublicationYear "2014" @default.
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