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/e² = 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)