Superconducting electronics from Josephson effects to quantum computing

Superconducting electronics -from Josephson effects to quantum computing -by Pascal Febvre and Paul Seidel

Superconducting electronics – Part 4 Junction arrays for applications

Voltage standards 3

Automated cryocoolerbased 10 Volt Josephson Voltage Standard System Calibration of voltage standards and high-precision voltmeters 1: Cryocooler with 10 Volt SIS Josephson junction array and 75 GHz microwave electronics 2: Control electronics, 3: EIP 578 B source looking counter, 4: Keithley 2182 A as null detector, 5: 3 -channel polarity reversal switch, 6: Sensors for temperature, pressure and humidity, 7: Laptop [Supracon] 8: 2 k. W compressor

10 V Josephson junction arrays � Maximum output voltage: 1 m. V per Josephson junction � Practical interest: 1 Volt up to 10 Volt � Preparation of large arrays (19700 Josephson junctions) � Zero current steps Vn = n f / KJ 90 n 64000 @ 10 V voltage 10 V 3. 4 V 10 µA [Supracon] current

Binary programmable standard [J. Kohlmann]

JJ-Arrays as radiation sources [H B Wang]

3 x 36 array: threshold for emitting power (synchronization) [P. Barbara et al. , PRL 82, 1963 (1999)]

Radiation from intrinsic Josephson array (single crystal mesa) 2007 [ L. Ozyuzer ]

THz emitters and applications

Applications at THz frequencies [M. Tonouchi]

Radiation sources – “THz gap” [M. Tonouchi]

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