Superconducting detectors are a modern technology applied in various fields. The microwave kinetic inductance detector (MKID) is one of the cutting-edge superconducting detectors. It is based on the principle of a superconducting resonator circuit. A radiation entering the MKID breaks the Cooper pairs in the superconducting resonator, and the intensity of the radiation is detected as a variation of the resonant condition. Therefore, calibration of the detector responsivity, i.e., the variation of the resonant phase with respect to the number of Cooper-pair breaks (quasiparticles), is important. We propose a method for responsivity calibration. Microwaves used for the detector readout locally raise the temperature in each resonator, which increases the number of quasiparticles. Since the magnitude of the temperature rise depends on the power of readout microwaves, the number of quasiparticles also depends on the power of microwaves. By changing the power of the readout microwaves, we simultaneously measure the phase difference and lifetime of quasiparticles. We calculate the number of quasiparticles from the measured lifetime and by using a theoretical formula. This measurement yields a relation between the phase responses as a function of the number of quasiparticles. We demonstrate this responsivity calibration using the MKID maintained at 285 mK. We also confirm the consistency between the results obtained using this method and conventional calibration methods in terms of the accuracy.
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15 July 2019
Research Article|
July 18 2019
A measurement method for responsivity of microwave kinetic inductance detector by changing power of readout microwaves
H. Kutsuma
;
H. Kutsuma
a)
1
Astronomical Institute, Tohoku University
, 6-3 Aramaki, Aoba-ku, Sendai 980-8578, Japan
2
RIKEN Center for Advanced Photonics
, 2-1 Hirosawa, Wako 351-0198, Japan
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M. Hattori;
M. Hattori
1
Astronomical Institute, Tohoku University
, 6-3 Aramaki, Aoba-ku, Sendai 980-8578, Japan
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R. Koyano;
R. Koyano
3
Graduate School of Science and Engineering, Saitama University
, Shimo-Okubo 255, Sakura-ku, Saitama 338-8570, Japan
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S. Mima;
S. Mima
2
RIKEN Center for Advanced Photonics
, 2-1 Hirosawa, Wako 351-0198, Japan
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S. Oguri
;
S. Oguri
2
RIKEN Center for Advanced Photonics
, 2-1 Hirosawa, Wako 351-0198, Japan
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C. Otani;
C. Otani
2
RIKEN Center for Advanced Photonics
, 2-1 Hirosawa, Wako 351-0198, Japan
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T. Taino;
T. Taino
3
Graduate School of Science and Engineering, Saitama University
, Shimo-Okubo 255, Sakura-ku, Saitama 338-8570, Japan
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O. Tajima
O. Tajima
4
Department of Physics, Faculty of Science, Kyoto University
, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
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Appl. Phys. Lett. 115, 032603 (2019)
Article history
Received:
May 20 2019
Accepted:
June 29 2019
Citation
H. Kutsuma, M. Hattori, R. Koyano, S. Mima, S. Oguri, C. Otani, T. Taino, O. Tajima; A measurement method for responsivity of microwave kinetic inductance detector by changing power of readout microwaves. Appl. Phys. Lett. 15 July 2019; 115 (3): 032603. https://doi.org/10.1063/1.5110692
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