Development of 0.5-V Josephson junction array devices for quantum voltage standards

doi:10.1088/1674-1056/28/6/068501

Abstract

The design, fabrication, and the characterization of a 0.5-V Josephson junction array device are presented for the quantum voltage standards in the National Institute of Metrology (NIM) of China. The device consists of four junction arrays, each of which has 1200 3-stacked Nb/Nb_xSi_1-x/Nb junctions and an on-chip superconducting microwave circuit which is mainly a power divider enabling each Josephson array being loaded with an equal amount of microwave power. A direct current (dc) quantum voltage of about 0.5 V with a~1 -mA current margin of the 1st quantum voltage step is obtained. To further prove the quality of NIM device, a comparison between the NIM device with the National Institute of Standards and Technology (NIST) programmable Josephson voltage standard (PJVS) system device is conducted. The difference of the reproduced 0.5-V quantum voltage between the two devices is about 0.55 nV, which indicates good agreement between the two devices. With the homemade device, we have realized a precise and applicable 0.5-V applicable-level quantum voltage.

Keywords: Josephson voltage standards Josephson junction superconducting-normal metal-superconducting (SNS) junction quantum device

Received: 22 November 2018
Revised: 27 March 2019
Accepted manuscript online:

PACS:	85.25.Cp	(Josephson devices)
	74.81.Fa	(Josephson junction arrays and wire networks)
	06.20.fa	(Units)
	84.37.+q	(Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.))

Fund:

Project supported by the National Key Research and Development Program of China (Grant No. 2016YFF02000402).

Corresponding Authors: Jinjin Li
E-mail: jinjinli@nim.ac.cn

Cite this article:

Lanruo Wang(王兰若), Jinjin Li(李劲劲), Wenhui Cao(曹文会), Yuan Zhong(钟源), Zhonghua Zhang(张钟华) Development of 0.5-V Josephson junction array devices for quantum voltage standards 2019 Chin. Phys. B 28 068501

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Development of 0.5-V Josephson junction array devices for quantum voltage standards

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