Not related to UTC, but here’s an interesting preprint on the final leg of the
quantum metrology triangle, namely a direct quantum method for measuring
current and calibrating the ampere in terms of the charge of the electron:
http://arxiv.org/pdf/1312.5669v1.pdf
(The other two legs are the quantum Hall effect for resistance and the
Josephson voltage standard.) This is a step toward implementing the new SI
definitions:
http://en.wikipedia.org/wiki/File:Relations_between_new_SI_units_definitions.png
The SI-second (or perhaps the hertz) is the keystone supporting all the other
base units save the mole.
Rob
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