Title :
Observation of Quantized Voltage Steps Using a Josephson Junction Array Driven by Optoelectronically Generated Pulses
Author :
Urano, Chiharu ; Kaneko, Nobuhisa ; Maezawa, Masaki ; Itatani, Taro ; Gorwadkar, Sucheta ; Saitou, Hiroshi ; Maeda, Joji ; Kiryu, Shogo
Author_Institution :
National Inst. of Adv. Ind. Sci. & Technol., Tsukuba
fDate :
4/1/2007 12:00:00 AM
Abstract :
In this paper, quantized voltage steps were observed by driving an overdamped Josephson junction array (JJA) with current pulse trains. The current pulse trains were generated by triggering a metal-semiconductor-metal photodetector installed close to JJA at 4.2 K with a mode-locked fiber laser. The intervals of the constant voltage steps were 10 muV, which agrees with the repetition frequency of the light source (49.7 MHz) and the number of Josephson junctions (100) in the JJA. This is the first step toward establishing an ac voltage standard at the National Institute of Advanced Industrial Science and Technology
Keywords :
measurement standards; superconducting arrays; superconducting junction devices; voltage measurement; 4.2 K; 49.7 MHz; Josephson device measurement; Josephson junction array; current pulse trains; metal-semiconductor-metal photodetector; mode-locked fiber laser; optoelectronically generated pulses; quantized voltage steps; superconductor-insulator-normal-insulator-superconductor device; voltage measurement; Fiber lasers; Frequency; Josephson junctions; Laser mode locking; Light sources; Optical pulse generation; Photodetectors; Pulse generation; Semiconductor laser arrays; Voltage; Josephson array; Josephson device measurement; standards; superconductor-insulator-normal-insulator-superconductor (SINIS) device; voltage measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2007.891065
