SI unit 'Ampere' will be replaced by a quantum-based measurement unit

Very soon the ampere -- the SI base unit of electrical current -- will take on an entirely new identity, and NIST scientists are at work on an innovative, quantum-based measurement system that will be consistent with the impending change.

http://www.nist.gov/pml/div684/grp02/counting-down-to-the-new-ampere.cfm