A unified quantum electrical platform for synchronous metrological realization of volt, ohm and ampere

Abstract

A co-located integration quantum electrical standard is essential to reduce reliance on distributed traceability in high-accuracy metrology, especially for portable and on-site use. Metrologically, realizing any two of voltage, resistance, and current is sufficient, as the third follows from Ohm's law. The combination of Josephson voltage and quantum Hall resistance offers better uncertainty, but conflicts with the tesla-level field for quantum Hall and near-zero field for Josephson operation. Here we report a compact unified platform enabling co-realization of quantum voltage and resistance in a single cryostat near 4 K, with quantum current derived via Ohm's law. A hierarchical magnetic shielding with staged attenuation and spatial confinement allows 6 T and below 50 nT to coexist within 270 mm axial separation with negligible cross-coupling. In integrated operation, the Josephson and quantum Hall subsystems agree with expected quantized values within relative standard uncertainties of 2.6E-9 and 1.4E-8, respectively. Linking them via an improved cryogenic current comparator realizes a 50 μA quantum current with relative uncertainty of 6.6E-8. These results demonstrate that three basic electrical units can be synchronously realized with superior metrological consistency on a single integrated platform, offering a viable transition from distributed calibration chains toward compact-integrated quantum-based realization.

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Cite

BibTeX RIS

BibTeX

@misc{wang2026unified,
  title = {{A unified quantum electrical platform for synchronous metrological realization of volt, ohm and ampere}},
  author = {Lei Wang and Lushuai Qian and Yunfeng Lu and Yang Shi and Xuanlu Yang and Xiaoding Huang and Zihan Lei and Yuan Zhang and Yaqiong Fu and Junsheng Cheng and Jianhua Liu and Xinning Hu and Yinming Dai and Jianting Zhao and Qiuliang Wang},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.09962},
  eprint = {2609.09962},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.09962},
}

RIS

TY  - UNPB
TI  - A unified quantum electrical platform for synchronous metrological realization of volt, ohm and ampere
AU  - Lei Wang
AU  - Lushuai Qian
AU  - Yunfeng Lu
AU  - Yang Shi
AU  - Xuanlu Yang
AU  - Xiaoding Huang
AU  - Zihan Lei
AU  - Yuan Zhang
AU  - Yaqiong Fu
AU  - Junsheng Cheng
AU  - Jianhua Liu
AU  - Xinning Hu
AU  - Yinming Dai
AU  - Jianting Zhao
AU  - Qiuliang Wang
PY  - 2026
DA  - 2026/09/09
PB  - arXiv
DO  - 10.48550/arxiv.2609.09962
UR  - https://arxiv.org/abs/2609.09962
AB  - A co-located integration quantum electrical standard is essential to reduce reliance on distributed traceability in high-accuracy metrology, especially for portable and on-site use. Metrologically, realizing any two of voltage, resistance, and current is sufficient, as the third follows from Ohm's law. The combination of Josephson voltage and quantum Hall resistance offers better uncertainty, but conflicts with the tesla-level field for quantum Hall and near-zero field for Josephson operation. Here we report a compact unified platform enabling co-realization of quantum voltage and resistance in a single cryostat near 4 K, with quantum current derived via Ohm's law. A hierarchical magnetic shielding with staged attenuation and spatial confinement allows 6 T and below 50 nT to coexist within 270 mm axial separation with negligible cross-coupling. In integrated operation, the Josephson and quantum Hall subsystems agree with expected quantized values within relative standard uncertainties of 2.6E-9 and 1.4E-8, respectively. Linking them via an improved cryogenic current comparator realizes a 50 μA quantum current with relative uncertainty of 6.6E-8. These results demonstrate that three basic electrical units can be synchronously realized with superior metrological consistency on a single integrated platform, offering a viable transition from distributed calibration chains toward compact-integrated quantum-based realization.
ER  -

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