Title :
Operation of Josephson Junctions With Current Pulses Generated by Triggering a Cold Photo Detector With an Optical Comb
Author :
Urano, Chiharu ; Kaneko, Nobuhisa ; Maezawa, Masaaki ; Gorwadkar, Sucheta ; Itatani, Taro ; Saitou, Hiroshi ; Maeda, Joji ; Kiryu, Shogo
Author_Institution :
Nat. Inst. of Adv. Ind. Sci. & Technol., Ibaraki
fDate :
6/1/2007 12:00:00 AM
Abstract :
We report the experimental results on a Josephson junction array (JJA) driven by current pulse trains generated by triggering a photo detector located in a cryostat with an optical comb. The key components in the experimental system are a mode locked fiber laser, a metal-semiconductor-metal (MSM) photoconductive switch, and an overdamped JJA. Optical pulse trains generated at room temperature are transmitted via an optical fiber to the MSM-photo detector installed at 4.2 K, and then converted into electric current pulse trains to drive the overdamped JJA. Quantized voltage steps have been verified at multiples of 10 muV, which agrees with the repetition rate of the pulse laser and the number of Josephson junctions in the JJA.
Keywords :
damping; fibre lasers; metal-semiconductor-metal structures; photodetectors; superconducting junction devices; Josephson junction array; MSM-photodetector; cold photodetector; cryostat; electric current pulse trains; metal-semiconductor-metal photoconductive switch; mode locked fiber laser; optical comb; optical fiber; overdamped JJA; pulse laser; quantized voltage steps; Fiber lasers; Josephson junctions; Laser mode locking; Optical arrays; Optical detectors; Optical fibers; Optical pulse generation; Optical pulses; Semiconductor laser arrays; Sensor arrays; Josephson array; pulse drive optoelectronics; standard; superconductor-insulator-normal-insulator-superconductor device; voltage measurement;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.897391
