Feasibility of the Josephson voltage and current standards on a single chip
arXiv:2410.11018 · doi:10.1063/5.0221404
Abstract
The quantum Josephson voltage standard is well established across the metrology community for many years. It relies on the synchronisation of the flux tunneling in the S/I/S Josepson junctions (JJ) with the microwave radiation (MW). The phenomenon is called the Shapiro steps. Together with the Quantum Hall resistance standard, the voltage standard forms the foundation of electrostatic metrology. The current is then defined as the ratio of the voltage and resistance. Realisation of the quantum current standard, would close the electrostatic metrological triangle of voltage-resistance-current. The current quantisation, the inverse Shapiro steps, was recently shown using the superconducting nanowires and small JJ. The effect is a synchronization of the MW with the Cooper pair tunnelling. This paves the way to combine the JJ voltage and current standards on the same chip and demonstrate feasibility of the multi-standard operation. We show the voltage and current quantization on the same chip up to frequency of 10 GHz, corresponding to the amplitudes 0.021 mV and 3.23 nA respectively. The accuracy of the voltage and current quantisation, however, is relatively low, 35 ppk and 100 ppk respectively. We discuss measures to optimise the JJs, circuit and environment to boost the amplitude and accuracy of the standards.
arXiv comment5 figures, 5 pages, published in APL
References in corpus (5)
- Single-electron current sources: towards a refined definition of ampere
- Quantized current steps due to the a.c. coherent quantum phase-slip effect
- Quantum bath suppression in a superconducting circuit by immersion cooling
- Demonstration of dual Shapiro steps in small Josephson junctions
- Synchronization of Bloch oscillations by gate voltage modulation