Operation of Josephson Junctions With Current Pulses Generated by Triggering a Cold Photo Detector With an Optical Comb

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) ph...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 2007-06, Vol.17 (2), p.870-873
Hauptverfasser:	Urano, C.., Kaneko, N.., Maezawa, M.., Gorwadkar, S.., Itatani, T.., Saitou, H.., Maeda, J.., Kiryu, S..
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Arrays Circuit properties Compound structure devices Current pulses Detectors Electric, optical and optoelectronic circuits Electronics Exact sciences and technology Fiber lasers Integrated optics. Optical fibers and wave guides Josephson array Josephson junctions Laser mode locking Optical and optoelectronic circuits Optical arrays Optical detectors Optical fibers Optical pulse generation Optical pulses Optoelectronic devices pulse drive optoelectronics Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Semiconductor laser arrays Sensor arrays Superconducting devices Superconductivity superconductor-insulator-normal-insulator-superconductor device Trains Voltage voltage measurement
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Zusammenfassung:	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.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/TASC.2007.897391