On 2/25/2014 5:15 PM, Fred Lunnon wrote:
Funny thing --- despite being determinedly sceptical concerning claims of functioning quantum-theoretical cryptographic and computational devices, I somehow find the quantum super-clock sounds eminently practicable. Anyone else care to comment? WFL
Sounds fascinating. Note that parts of the entangled superclock located at different latitudes on the Earth will be keeping different sidereal times. This is because the Earth's surface is (roughly) at constant gravitational potential so the GR effect will be the same at different latitudes, but the special relativistic effect will be greater nearer the equator. So, relative to sidereal time, the equatorial parts will run slower than the polar parts. I think this just shows there's no consistent way to define simultaneity on a rotating frame - but I'm not sure. Brent Meeker