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UID:UW-Physics-Event-3323
DTSTART:20140227T200000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T193543Z
LAST-MODIFIED:20140225T143435Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Coherent control of strongly interacting Rydberg gases in ther
 mal vapor cells\, Atomic Physics Seminar\, Prof. Tilman Pfau\, Univers
 ity of Stuttgart
DESCRIPTION:Rydberg atoms are of great interest due to their prospects
  in quantum information processing. Coherent control of the strong Ryd
 berg-Rydberg interaction allows for the realization of quantum operati
 ons and devices such as quantum gates and single-photon sources. To da
 te\, impressive experimental progress has been limited to the ultracol
 d domain [1]. Being able to exploit this interaction in a coherent man
 ner in thermal vapor would eliminate the need for cooling and trapping
  of atoms and thus offer new prospects for applications in terms of in
 tegration and scalability.&lt\;br&gt\;<br><br>
\nWe present our progre
 ss on the coherent control and investigation of Rydberg atoms in small
  vapor cells. We show that we are able to drive Rabi oscillations on t
 he nanosecond timescale to a Rydberg state by using a pulsed laser exc
 itation and are therefore faster than the coherence time limitation gi
 ven by the Doppler width [2].&lt\;br&gt\;<br><br>
\nA systematic inves
 tigation of the dephasing of these oscillations for different atomic d
 ensities and Rydberg S-states (n = 22-40) reveals a clear signature fo
 r Rydberg-Rydberg interaction which is the basis for quantum devices b
 ased on the Rydberg blockade. Due to the high excitation bandwidth we 
 are probing interaction level shifts up to a few GHz which correspond 
 to very small interatomic distances (&amp\;lt\; 1μm). Despite the com
 plicated level structure for Rydberg molecular states at these distanc
 es we find that the scaling with principle quantum number is still con
 sistent with van der Waals type interaction. The strength of the inter
 action exceeds the energy scale of thermal motion (i.e. the Doppler br
 oadening) and therefore enables strong quantum correlations above room
  temperature [3].&lt\;br&gt\;<br><br>
\nFurthermore we present our lat
 est results on the combination of the pulsed Rydberg excitation with a
  four-wave-mixing scheme [4] and our progress towards the creation of 
 non-classical light. &lt\;br&gt\;<br><br>
\n[1] M. Saffman et al.\, RM
 P 82\, 2313 (2010) and references therein &lt\;br&gt\;<br><br>
\n[2] B
 . Huber et al.\, PRL 107\, 243001 (2011) &lt\;br&gt\;<br><br>
\n[3] T.
  Baluktsian et al.\, PRL 110\, 123001 (2013)&lt\;br&gt\;<br><br>
\n[4]
  M. Saffman and T. G. Walker\, Phys. Rev. A 66\, 065403 (2002)\, M. M.
  Müller\, et al. Phys. Rev. A 87\, 053412 (2013)&lt\;br&gt\;<br><br>

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URL:https://www.physics.wisc.edu/events/?id=3323
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