Theoretical study of reflection spectroscopy for superconducting quantum parametrons

Superconducting parametrons in the single-photon Kerr regime, also called KPOs, have been attracting increasing attention in terms of their applications to quantum annealing and universal quantum computation. It is of practical importance to obtain information of superconducting parametrons operatin...

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Main Authors: S Masuda, A Yamaguchi, T Yamaji, T Yamamoto, T Ishikawa, Y Matsuzaki, S Kawabata
Format: Article
Language:English
Published: IOP Publishing 2021-01-01
Series:New Journal of Physics
Subjects:
Online Access:https://doi.org/10.1088/1367-2630/ac21e1
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author S Masuda
A Yamaguchi
T Yamaji
T Yamamoto
T Ishikawa
Y Matsuzaki
S Kawabata
author_facet S Masuda
A Yamaguchi
T Yamaji
T Yamamoto
T Ishikawa
Y Matsuzaki
S Kawabata
author_sort S Masuda
collection DOAJ
description Superconducting parametrons in the single-photon Kerr regime, also called KPOs, have been attracting increasing attention in terms of their applications to quantum annealing and universal quantum computation. It is of practical importance to obtain information of superconducting parametrons operating under an oscillating pump field. Spectroscopy can provide information of a superconducting parametron under examination, such as energy level structure, and also useful information for calibration of the pump field. We theoretically study the reflection spectroscopy of superconducting parametrons, and develop a method to obtain the reflection coefficient. We present formulae of the reflection coefficient, the nominal external and the internal decay rates, and examine the obtained spectra. It is shown that the difference of the populations of energy levels manifests itself as a dip or peak in the amplitude of the reflection coefficient, and one can directly extract the coupling strength between the energy levels by measuring the nominal decay rates when the pump field is sufficiently large.
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spelling doaj.art-bcbf6ce05b904019bcee9eb78f9a2cd02023-08-08T15:38:40ZengIOP PublishingNew Journal of Physics1367-26302021-01-0123909302310.1088/1367-2630/ac21e1Theoretical study of reflection spectroscopy for superconducting quantum parametronsS Masuda0https://orcid.org/0000-0002-8286-1925A Yamaguchi1T Yamaji2T Yamamoto3T Ishikawa4Y Matsuzaki5S Kawabata6Research Center for Emerging Computing Technologies (RCECT), National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1, Umezono, Tsukuba, Ibaraki 305-8568, Japan; Author to whom any correspondence should be addressed.System Platform Research Laboratories , NEC Corporation, Kawasaki, Kanagawa 211-0011, Japan; NEC-AIST Quantum Technology Cooperative Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba, Ibaraki 305-8568, JapanSystem Platform Research Laboratories , NEC Corporation, Kawasaki, Kanagawa 211-0011, Japan; NEC-AIST Quantum Technology Cooperative Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba, Ibaraki 305-8568, JapanSystem Platform Research Laboratories , NEC Corporation, Kawasaki, Kanagawa 211-0011, Japan; NEC-AIST Quantum Technology Cooperative Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba, Ibaraki 305-8568, JapanResearch Center for Emerging Computing Technologies (RCECT), National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1, Umezono, Tsukuba, Ibaraki 305-8568, Japan; NEC-AIST Quantum Technology Cooperative Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba, Ibaraki 305-8568, JapanResearch Center for Emerging Computing Technologies (RCECT), National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1, Umezono, Tsukuba, Ibaraki 305-8568, Japan; NEC-AIST Quantum Technology Cooperative Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba, Ibaraki 305-8568, JapanResearch Center for Emerging Computing Technologies (RCECT), National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1, Umezono, Tsukuba, Ibaraki 305-8568, Japan; NEC-AIST Quantum Technology Cooperative Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba, Ibaraki 305-8568, JapanSuperconducting parametrons in the single-photon Kerr regime, also called KPOs, have been attracting increasing attention in terms of their applications to quantum annealing and universal quantum computation. It is of practical importance to obtain information of superconducting parametrons operating under an oscillating pump field. Spectroscopy can provide information of a superconducting parametron under examination, such as energy level structure, and also useful information for calibration of the pump field. We theoretically study the reflection spectroscopy of superconducting parametrons, and develop a method to obtain the reflection coefficient. We present formulae of the reflection coefficient, the nominal external and the internal decay rates, and examine the obtained spectra. It is shown that the difference of the populations of energy levels manifests itself as a dip or peak in the amplitude of the reflection coefficient, and one can directly extract the coupling strength between the energy levels by measuring the nominal decay rates when the pump field is sufficiently large.https://doi.org/10.1088/1367-2630/ac21e1superconducting parametrons in the single-photon Kerr regimeKPOspectroscopy
spellingShingle S Masuda
A Yamaguchi
T Yamaji
T Yamamoto
T Ishikawa
Y Matsuzaki
S Kawabata
Theoretical study of reflection spectroscopy for superconducting quantum parametrons
New Journal of Physics
superconducting parametrons in the single-photon Kerr regime
KPO
spectroscopy
title Theoretical study of reflection spectroscopy for superconducting quantum parametrons
title_full Theoretical study of reflection spectroscopy for superconducting quantum parametrons
title_fullStr Theoretical study of reflection spectroscopy for superconducting quantum parametrons
title_full_unstemmed Theoretical study of reflection spectroscopy for superconducting quantum parametrons
title_short Theoretical study of reflection spectroscopy for superconducting quantum parametrons
title_sort theoretical study of reflection spectroscopy for superconducting quantum parametrons
topic superconducting parametrons in the single-photon Kerr regime
KPO
spectroscopy
url https://doi.org/10.1088/1367-2630/ac21e1
work_keys_str_mv AT smasuda theoreticalstudyofreflectionspectroscopyforsuperconductingquantumparametrons
AT ayamaguchi theoreticalstudyofreflectionspectroscopyforsuperconductingquantumparametrons
AT tyamaji theoreticalstudyofreflectionspectroscopyforsuperconductingquantumparametrons
AT tyamamoto theoreticalstudyofreflectionspectroscopyforsuperconductingquantumparametrons
AT tishikawa theoreticalstudyofreflectionspectroscopyforsuperconductingquantumparametrons
AT ymatsuzaki theoreticalstudyofreflectionspectroscopyforsuperconductingquantumparametrons
AT skawabata theoreticalstudyofreflectionspectroscopyforsuperconductingquantumparametrons