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Tunable microwave impedance matching to a high impedance source using a Josephson metamaterial

We report the efficient coupling of a 50  Ω microwave circuit to a high impedance conductor. We use an impedance transformer consisting of a λ/4 co-planar resonator whose inner conductor contains an array of superconducting quantum interference devices (SQUIDs), providing it with a tunable lineic in...

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Published in:Applied physics letters 2013-11, Vol.103 (21)
Main Authors: Altimiras, Carles, Parlavecchio, Olivier, Joyez, Philippe, Vion, Denis, Roche, Patrice, Esteve, Daniel, Portier, Fabien
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cited_by cdi_FETCH-LOGICAL-c418t-7738edfb0c0e81bb2e20096eedfb766cd40f15ca680341aec2c14e5a0095eb43
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container_issue 21
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container_title Applied physics letters
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creator Altimiras, Carles
Parlavecchio, Olivier
Joyez, Philippe
Vion, Denis
Roche, Patrice
Esteve, Daniel
Portier, Fabien
description We report the efficient coupling of a 50  Ω microwave circuit to a high impedance conductor. We use an impedance transformer consisting of a λ/4 co-planar resonator whose inner conductor contains an array of superconducting quantum interference devices (SQUIDs), providing it with a tunable lineic inductance L∼80 μ0, resulting in a characteristic impedance ZC∼1 kΩ. The impedance matching efficiency is characterized by measuring the shot noise power emitted by a dc biased tunnel junction connected to the resonator. We demonstrate matching to impedances in the 15 to 35 kΩ range with bandwidths above 100 MHz around a resonant frequency tunable between 4 and 6 GHz.
doi_str_mv 10.1063/1.4832074
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subjects Applied physics
Arrays
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Conductors
High impedance
IMPEDANCE
Impedance matching
Inductance
Metamaterials
Microwave circuits
MICROWAVE RADIATION
Noise measurement
Physics
Resonant frequencies
RESONATORS
Shot noise
SQUID DEVICES
SUPERCONDUCTING JUNCTIONS
Superconducting quantum interference devices
TRANSFORMERS
TUNNEL EFFECT
Tunnel junctions
title Tunable microwave impedance matching to a high impedance source using a Josephson metamaterial
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