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2014 Fiscal Year Final Research Report

Development of thermodynamic temperature measurement technique based on Josephson effect and Quantum Hall effect

Research Project

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Project/Area Number 22246013
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied physics, general
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

CHIHARU Urano  独立行政法人産業技術総合研究所, 計測標準研究部門, 主任研究員 (30356589)

Co-Investigator(Kenkyū-buntansha) MARUYAMA Michitaka  産業技術総合研究所, 計測標準研究部門, 主任研究員 (30415947)
KANEKO Nobu-hisa  産業技術総合研究所, 計測標準研究部門, 研究科長 (30371032)
OE Takehiko  産業技術総合研究所, 計測標準研究部門, 主任研究員 (30443170)
DOMAE Atsushi  産業技術総合研究所, 計測標準研究部門, 主任研究員 (20357552)
FUKUYAMA Yasuhiro  産業技術総合研究所, 計測標準研究部門, 主任研究員 (00357889)
TAMBA Jun  産業技術総合研究所, 計測標準研究部門, 研究科長 (10357494)
YAMAZAWA Kazuaki  産業技術総合研究所, 計測標準研究部門, 研究室長 (30306873)
KIRYU Shogo  東京都市大学, 工学部生体医工学科, 教授 (00356908)
YAMADA Takahiro  産業技術総合研究所, ナノエレクトロニクス研究部門, 主任研究員 (00377871)
Co-Investigator(Renkei-kenkyūsha) YAMAMORI Hirotake  産業技術総合研究所, ナノエレクトロニクス研究部門, 主任研究員 (00358293)
Project Period (FY) 2010-04-01 – 2015-03-31
Keywords熱雑音 / ナイキストの式 / 量子電圧雑音源 / ジョセフソン接合 / ボルツマン定数 / 標準
Outline of Final Research Achievements

We have been developing a Johnson noise thermometry system using quantum voltage noise source toward redefinition of the Boltzmann constant k. Johnson noise thermometry is based on Johnson-Nyquist Equation. Power spectrum density of a sensor resistor is measured with respect to power spectrum density of the quantum voltage noise source. The noise power of the quantum voltage noise source is expressed in terms of the Planck constant h, electric charge e, sampling frequency of a pulse pattern generator f, and a given numerical factor. k obtained in our measurements has offset of +(40±20) ppm form the CODATA value. In order to contribute to redefinition of the Boltzmann constant, it is necessary to overcome this offset problem and reduce the uncertainty 1/20 times smaller than the current value.

Free Research Field

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Published: 2016-06-03  

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