<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><span style="font-family:arial,sans-serif;font-size:12.8px">Hi </span><div style="font-family:arial,sans-serif;font-size:12.8px">this is the paper I plan to discuss in our journal club meeting.</div><div style="font-family:arial,sans-serif;font-size:12.8px">Not nuclear physics but ion traps and atomic physics. There </div><div style="font-family:arial,sans-serif;font-size:12.8px">are talks about redefining the second. This is the excuse to</div><div style="font-family:arial,sans-serif;font-size:12.8px">read about atomic clocks. </div><div style="font-family:arial,sans-serif;font-size:12.8px"> </div><div style="font-family:arial,sans-serif;font-size:12.8px"><a href="https://arxiv.org/pdf/0911.4527.pdf" target="_blank">https://arxiv.org/pdf/0911.<wbr>4527.pdf</a><br><div><br class="gmail-m_-6276366441243473806webkit-block-placeholder"></div><div>Things that are important </div><div>1/ Basic idea for a clock (page 3 and 4) <a href="https://arxiv.org/pdf/1407.3493.pdf" target="_blank">https://arxiv.org/pdf/1407.<wbr>3493.pdf</a></div><div>2/ Quantum logic spectroscopy.</div><div><br></div><div><div style="font-size:12.8px">these are some questions and some guidelines to read the paper if you are new to this kind of <span style="font-size:12.8px">experiments like me.</span></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">1/ To make a clock one needs an oscillator and a counter.</div><div style="font-size:12.8px"> Atoms are oscillators. Here Al ion is used as an oscillator.</div><div style="font-size:12.8px"> Why ?</div><div style="font-size:12.8px">2/ Once you have the ion you want to probe it. Cold ions are better.</div><div style="font-size:12.8px"> Can not cool Al ion directly</div><div style="font-size:12.8px"> Why ?</div><div style="font-size:12.8px">3/ So one traps another and cools it to sympathetically cool the Al ion.</div><div style="font-size:12.8px">4/ To probe the Al ion, one actually probes the other ion. </div><div style="font-size:12.8px"> This is done via QLS. I will try to discuss this in the meeting.</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">5/ After one sees the transition it is necessary to find out what effects the transition.</div><div style="font-size:12.8px"> This is in Table 1. </div><div style="font-size:12.8px"> Particular attention : quadratic Zeeman shift.</div><div style="font-size:12.8px"> Not linear why ? </div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">6/ To characterize the clocks one uses Allan deviation.</div><div style="font-size:12.8px"> What is this ?</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">7/ Once you make one clock you can make another clock and compare.</div><div style="font-size:12.8px">this is what the paper does. </div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">Bonus reading: </div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">David Wineland’s Nobel lecture </div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><a href="https://www.nobelprize.org/nobel_prizes/physics/laureates/2012/wineland-lecture.pdf" target="_blank">https://www.nobelprize.org/<wbr>nobel_prizes/physics/<wbr>laureates/2012/wineland-<wbr>lecture.pdf</a></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">And page 3 and 4 of </div><div style="font-size:12.8px">this </div><div style="font-size:12.8px"><blockquote type="cite"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="word-wrap:break-word"> <a href="https://arxiv.org/pdf/1407.3493.pdf" target="_blank">https://arxiv.org/pdf/1407.34<wbr>93.pdf</a></div></blockquote></div></div></blockquote><br></div><div style="font-size:12.8px">Thank you,</div><div style="font-size:12.8px">Mukut</div></div></div></div>
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