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<p class="MsoTitle" style="margin-right:-.5in"><b style="mso-bidi-font-weight:
normal"><span style="font-family:"Times New Roman"">Seminar on<o:p></o:p></span></b></p>
<p class="MsoTitle" style="margin-right:-.5in"><b style="mso-bidi-font-weight:
normal"><span style="font-size:8.0pt;mso-bidi-font-size:12.0pt;font-family:
"Times New Roman""><o:p> </o:p></span></b></p>
<p class="MsoTitle" style="margin-right:-.5in"><b style="mso-bidi-font-weight:
normal"><span style="font-size:8.0pt;mso-bidi-font-size:12.0pt;font-family:
"Times New Roman""><o:p> </o:p></span></b></p>
<p class="MsoTitle" style="margin-right:-.5in"><b style="mso-bidi-font-weight:
normal"><span style="font-size:8.0pt;mso-bidi-font-size:12.0pt;font-family:
"Times New Roman""><o:p> </o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4"><b style="mso-bidi-font-weight:
normal"><span style="letter-spacing: 1.5pt; ">Modern Optics and Spectroscopy</span></b><span style="font-family:Arial;
mso-bidi-font-family:"Times New Roman";letter-spacing:1.5pt"><o:p></o:p></span></font></p>
<p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><span style="font-family: Arial; letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><font class="Apple-style-span" size="4">Electronic coherence in a gas of dipole-dipole coupled Rydberg atoms<o:p></o:p></font></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span style="letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></i></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4"><b style="mso-bidi-font-weight:
normal">Robert Jones</b><span style="letter-spacing: 1pt; ">,<o:p></o:p></span></font></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">University of Virginia</font></span><span class="Apple-style-span" style="letter-spacing: 1px; font-size: large; "> </span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">Tuesday, February 28, 2012</font></span></p>
<div></div>
<font class="Apple-style-span" size="4"><br>
</font>
<p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">12:00 – 1:00 p.m.</font></span></p>
<p class="MsoNormal" style="text-align:justify"><font class="Apple-style-span" size="4"><span style="color: black; ">The great spatial extent of highly-excited Rydberg atoms endows them with large dipole moments and electric polarizabilities, making them extremely
sensitive to external fields and neighboring atoms. We use cold diffuse ensembles of Rydberg atoms to explore few-and many-body dipole-dipole interactions at long range. We have recently demonstrated a novel time-domain method to probe coherence in ensembles
where the dipole-dipole couplings are nearly resonant. In our experiments, short laser pulses create coherent superpositions of few-atom Rydberg eigenstates which evolve under the influence of pulsed electric field sequences. The field pulses coherently enhance
the probability for finding atoms in $np$, rather than initially excited $ns$ states. The persistence of the enhancement indicates coherence times exceeding 10$\mu$s, comparable to the spontaneous emission lifetime of the atoms and roughly two orders of magnitude
longer than macroscopic dephasing times in the same system. Simulations indicate that atom motion is primarily responsible for the eventual loss of coherence. Beyond the coherence measurement, the experiments provide some evidence for coherent control of the
few-body system in the form of pulsed-field enhancement of the coherence time.</span><span style="color: black; "><o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-align:justify"><o:p><font class="Apple-style-span" size="4"> </font></o:p></p>
<p class="MsoNormal" style="text-align:justify"><o:p><font class="Apple-style-span" size="4"> </font></o:p></p>
<p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4">Grier Room, MIT Bldg 34-401<o:p></o:p></font></p>
<p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4">Refreshments served after the lecture</font><font class="Apple-style-span" size="6"><o:p></o:p></font></p>
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