A widely tunable parametric amplifier based on a SQUID array resonator
classification
❄️ cond-mat.supr-con
cond-mat.mes-hall
keywords
amplifiersquidarrayparametricresonatorableaddsadjust
read the original abstract
We create a Josephson parametric amplifier from a transmission line resonator whose inner conductor is made from a series SQUID array. By changing the magnetic flux through the SQUID loops, we are able to adjust the circuit's resonance frequency and, consenquently, the center of the amplified band, between 4 and 7.8 GHz. We observe that the amplifier has gains as large as 28 dB and infer that it adds less than twice the input vacuum noise.
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