  We propose a way to realize a programmable quantum current standard (PQCS)
from the Josephson voltage standard and the quantum Hall resistance standard
(QHR) exploiting the multiple connection technique provided by the quantum Hall
effect (QHE) and the exactness of the cryogenic current comparator. The PQCS
could lead to breakthroughs in electrical metrology like the realization of a
programmable quantum current source, a quantum ampere-meter and a simplified
closure of the Quantum Metrological Triangle. Moreover, very accurate
universality tests of the QHE could be performed by comparing PQCS based on
different QHRs.
