Nanotechnology for Next-Generation Josephson Voltage Standards
Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
We have developed two voltage standard systems: the programmable Josephson voltage standard and the Josephson arbitrary waveform synthesizer. The programmable system is fully automated and provides stable programmable DC voltages from -1.2 V to +1.2 V. The synthesizer is the first quantum-based AC voltage standrd source. It uses perfectly quantized Josephson pulses to generate arbitrary waveforms with low harmonic distortion and stable, calculable time-dependent voltages. Both systems are presently limited to output voltages less than 10 V as a result of frequency requirements and the limits of junction fabrication technology. We describe the development of fabrication technology for these systems and describe the circuit- and fabrication-related constraints that presently limit system performance. Finally, we propose the use of lumped arrays of junctions to achieve higher practical voltages through development of a nanoscale junction technology, in which 15,000 junctions are closely spaced at 50 nm to 100 nm internals.
Proc., Symp. on Microtech. in Metrol. and Metrol. in Microsys.
, Dresselhaus, P.
and Burroughs, C.
Nanotechnology for Next-Generation Josephson Voltage Standards, Proc., Symp. on Microtech. in Metrol. and Metrol. in Microsys., Delft, NL, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=15244
(Accessed December 3, 2023)