[time-nuts] MuQuans MuClock

[Attila Kinali]

On Sat, 19 Aug 2017 16:46:29 -0400
paul swed <paulswedb at gmail.com> wrote:

> On Sat, Aug 19, 2017 at 3:46 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
> > > On Aug 19, 2017, at 3:04 PM, Ole Petter Ronningen <opronningen at gmail.com>

> > > I just stumbled across this:
> > > https://www.muquans.com/index.php/products/mclock
> > >
> > > A commercially available cold atom rubidium clock! My apologies if this
> > has
> > > already been reported on the list.


They presented their clock at EFTF/IFCS a month ago.
They are still characterizing it (i.e. they put one
up at SYRTE and measure what it's doing), but sofar
the results look quite good.

The paper will be put online in a couple of weeks/months
on the EFTF homepage for everyone to read.

I will refrain from recounting what I have seen,
as I forgot too many of the details and might be more
wrong than right. Sorry about that.

> It hasn't been discussed before that I can recall.
> But its a cold RB clock and though it stable its still a secondary
> reference.

Err.. no. It is a primary standard. The difference between a primary
and a secondary standard is, that the primary has a guaranteed accuracy
without calibration, while the secondary standard is "just" stable,
but can be off a little bit. These MuClocks do not need calibartion
at all, as they are interogating (almost) completely undisturbed
atoms in vacuum, in free fall.

But they use a secondary _realisation_ of the second as defined by
the BIPM.


			Attila Kinali

-- 
You know, the very powerful and the very stupid have one thing in common.
They don't alters their views to fit the facts, they alter the facts to
fit the views, which can be uncomfortable if you happen to be one of the
facts that needs altering.  -- The Doctor