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High impedance Josephson junction resonators in the transmission line geometry

Ranni, Antti LU ; Havir, Harald LU ; Haldar, Subhomoy LU and Maisi, Ville LU (2023) In Applied Physics Letters 123(11). p.114002-114002
Abstract
In this article, we present an experimental study of microwave resonators made out of Josephson junctions. The junctions are embedded in a transmission line geometry so that they increase the inductance per length for the line. By comparing two devices with different input/output coupling strengths, we show that the coupling capacitors, however, add a significant amount to the total capacitance of the resonator. This makes the resonators with high coupling capacitance to act rather as lumped element resonators with inductance from the junctions and capacitance from the end sections. Based on a circuit analysis, we show that the input and output couplings of the resonator are limited to a maximum value of ω_rZ_0/4Z_r⁠, where ωr is the... (More)
In this article, we present an experimental study of microwave resonators made out of Josephson junctions. The junctions are embedded in a transmission line geometry so that they increase the inductance per length for the line. By comparing two devices with different input/output coupling strengths, we show that the coupling capacitors, however, add a significant amount to the total capacitance of the resonator. This makes the resonators with high coupling capacitance to act rather as lumped element resonators with inductance from the junctions and capacitance from the end sections. Based on a circuit analysis, we show that the input and output couplings of the resonator are limited to a maximum value of ω_rZ_0/4Z_r⁠, where ωr is the resonance frequency and Z_0 and Z_r are the characteristic impedances of the input/output lines and the resonator, respectively. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
microwave, strong coupling, Josephson junction
in
Applied Physics Letters
volume
123
issue
11
pages
5 pages
publisher
American Institute of Physics (AIP)
external identifiers
  • scopus:85171561538
ISSN
1077-3118
DOI
10.1063/5.0164323
language
English
LU publication?
yes
id
0cc0dc58-f2ed-44c2-9919-37419870eac4
date added to LUP
2023-10-30 09:33:08
date last changed
2023-11-21 23:49:13
@article{0cc0dc58-f2ed-44c2-9919-37419870eac4,
  abstract     = {{In this article, we present an experimental study of microwave resonators made out of Josephson junctions. The junctions are embedded in a transmission line geometry so that they increase the inductance per length for the line. By comparing two devices with different input/output coupling strengths, we show that the coupling capacitors, however, add a significant amount to the total capacitance of the resonator. This makes the resonators with high coupling capacitance to act rather as lumped element resonators with inductance from the junctions and capacitance from the end sections. Based on a circuit analysis, we show that the input and output couplings of the resonator are limited to a maximum value of ω_rZ_0/4Z_r⁠, where ωr is the resonance frequency and Z_0 and Z_r are the characteristic impedances of the input/output lines and the resonator, respectively.}},
  author       = {{Ranni, Antti and Havir, Harald and Haldar, Subhomoy and Maisi, Ville}},
  issn         = {{1077-3118}},
  keywords     = {{microwave; strong coupling; Josephson junction}},
  language     = {{eng}},
  number       = {{11}},
  pages        = {{114002--114002}},
  publisher    = {{American Institute of Physics (AIP)}},
  series       = {{Applied Physics Letters}},
  title        = {{High impedance Josephson junction resonators in the transmission line geometry}},
  url          = {{http://dx.doi.org/10.1063/5.0164323}},
  doi          = {{10.1063/5.0164323}},
  volume       = {{123}},
  year         = {{2023}},
}