New Method for High-Accuracy Determination of the Fine-Structure Constant Based on Quantized Hall Resistance

Future work

Extension to fractional quantum Hall states raises the question of whether fractional filling factors yield equally fundamental resistance standards. Graphene-based devices now exhibit the quantum Hall effect at room temperature, suggesting practical metrological standards without cryogenic infrastructure. Linking R_K to the revised SI kilogram via the watt balance completes a self-consistent set of quantum electrical standards.