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We report on realization of 10 quantum Hall devices in series fabricatedusing epitaxial graphene on silicon carbide. Precision measurements with aresistance bridge indicates that the quantized Hall resistance across an arrayat filling factor 2 is equivalent to 5 h/e^2 within the measurement uncertaintyof approximately 4 10-8. A quantum-Hall phase diagram for the array shows thata metrological quantization of 5 h/e^2 can be achieved at the magnetic field of6 T and temperature of 4 K. This experiment demonstrates the possibility oftimely unchangeable resistance reference in various ranges in relaxedexperimental conditions.

Realization of 5 h/e^2 with graphene quantum Hall resistance array