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A programmable quantum current generator based on the application of Ohm'slaw to quantum voltage and resistance standards has demonstrated a realizationof the ampere from the elementary charge with a $10^{-8}$ relative uncertainty[J. Brun-Picard et al. PRX 6, 041051, 2016]. Here, we report on improvements ofthe device leading to a noise reduction of the generated quantized current. Theimproved quantum current generator is used to calibrate different ammeters withlower measurement uncertainties. Besides, measurements of its quantized currentusing a calibrated Ultrastable Low-Noise Current Amplifier (ULCA) have shownthat the realizations of the ampere at PTB (Physikalisch-TechnischeBundesanstalt) and LNE (Laboratoire national de m\'{e}trologie et d'essais) inthe range $\pm50$ $\mu$A agreed to -3.7 parts in $10^{7}$ with a combinedstandard uncertainty of 3.1 parts in $10^{7}$ (coverage factor$k_\mathrm{c}=1$).

Improvements of the programmable quantum current generator for better traceability of electrical current measurements