this post was submitted on 31 Mar 2025
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[–] A_A@lemmy.world 17 points 4 days ago* (last edited 4 days ago)

Quantum based resistors :
https://en.m.wikipedia.org/wiki/Quantum_Hall_effect
Quantum Hall effect →
Applications →
Electrical resistance standards :

(...) Later, the 2019 revision of the SI fixed exact values of h and e, resulting in an exact
R~K~ = h/e^2^ = 25812.80745... Ω.

(this is precise to at least 10 significant digits)

Quantum Ampere Standard
https://www.nist.gov/noac/technology/current-and-voltage/quantum-ampere-standard
.
https://www.nist.gov/noac/technology/current-and-voltage

(...) Quantum-based measurements for voltage and current are moving toward greater miniaturization (...)

(there also been research for defining a quantum based volt standard)