[Isac-journal-club] This weeks paper

[journalclub]

Hi
this is the paper I plan to discuss in our journal club meeting.
Not nuclear physics but ion traps and atomic physics. There
are talks about redefining the second. This is the excuse to
read about atomic clocks.

https://arxiv.org/pdf/0911.4527.pdf

Things that are important
1/ Basic idea for a clock (page 3 and 4)  https://arxiv.org/pdf/1407.
3493.pdf
2/ Quantum logic spectroscopy.

these are some questions and some guidelines to read the paper if you are
new to this kind of experiments like me.

1/ To make a clock one needs an oscillator and a counter.
    Atoms are oscillators. Here Al ion is used as an oscillator.
    Why ?
2/ Once you have the ion you want to probe it. Cold ions are better.
    Can not cool Al ion directly
    Why ?
3/ So one traps another and cools it to sympathetically cool the Al ion.
4/ To probe the Al ion, one actually probes the other ion.
    This is done via QLS. I will try to discuss this in the meeting.

5/ After one sees the transition  it is necessary to find out what effects
the transition.
  This is in Table 1.
  Particular attention :  quadratic Zeeman shift.
  Not linear why ?

6/ To characterize the clocks one uses Allan deviation.
    What is this ?

7/ Once you make one clock you can make another clock and compare.
this is what the paper does.


Bonus reading:

David Wineland’s Nobel lecture

https://www.nobelprize.org/nobel_prizes/physics/laureates/2012/wineland-
lecture.pdf

And page 3 and 4 of
this

 https://arxiv.org/pdf/1407.3493.pdf
>

Thank you,
Mukut
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