Título: Measurement capabilities of AC Josephson voltage sources.
Resumen: During the past 30 years, the quantum behavior of Josephson junctions has been exploited to greatly improve the accuracy of dc voltage measurements. A number of new superconductive device technologies and systems are now in use that provide novel features such as stable, programmable dc voltages and quantum-based ac waveform synthesis. Different approaches have been developed for ac applications in the audio-frequency regime and for 60 Hz power metrology. The new quantum voltage sources are essentially single-bit and multi-bit superconducting digital-to-analog converters that exploit in different ways the perfectly quantized voltage pulses of Josephson junctions. I will review the superconducting technology and broadband circuit designs, their present system implementations, the precision measurement techniques that have been developed, and the future research and development goals at NIST.
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PRE_Sesion Plenaria_SamBenz.pdf