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TZID:Europe/Paris
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UID:0-861@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20230124T110000
DTEND;TZID=Europe/Paris:20230124T120000
DTSTAMP:20230117T170003Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-patrick-cheinet-lac-saclay/
SUMMARY:Séminaire du LPTMS : Patrick Cheinet (LAC) - Salle des séminaires
  du FAST et du LPTMS\, bâtiment Pascal n°530 - 24 Jan 23 11:00
DESCRIPTION:Controlling auto-ionization of doubly excited Rydberg states\, 
 a new tool for Rydberg-based quantum processors\nPatrick Cheinet (Laborato
 ire Aimé Cotton)\nHybrid: onsite seminar + zoom.\nhttps://cnrs.zoom.us/j/
 99258460338?pwd=dlhJUzRUVmx6c21MRWJrS2xtRlNYdz09\nIn a recent paper [Pham2
 022]\, our team has demonstrated the possibility to tune a laser close to 
 the auto-ionizing doubly-excited Rydberg states of ytterbium atoms and obt
 ain a large AC-Stark shift while suppressing the usual auto-ionization:\nI
 n a divalent atom like ytterbium\, after exciting a first electron to a Ry
 dberg state\, the second electron will display optical transitions similar
  to the ones existing in the corresponding ion. The excitation of these tr
 ansitions is called Isolated Core Excitation (ICE). Unfortunately\, the re
 sulting doubly excited atom will usually auto-ionize quickly. Indeed the t
 otal energy is far above the first ionization limit and the Coulomb intera
 ction allows the two electrons to exchange energy. It is known though that
  many doubly excited states exist and that quantum interferences allow to 
 control the auto-ionization down to zero for the correct destructive inter
 ferences. We have thus studied these auto-ionization zeros\, with a specif
 ic interest to the resulting AC-Stark shift to check if it also vanishes o
 r not. We have demonstrated both theoretically and experimentally that it 
 does not vanish\, thus proving the possibility to use ICE light to perform
  quantum operations on Rydberg qbits in atomic quantum processors.\n\n[Pha
 m2022] K.-L. Pham et al.\, PRX Quantum 3\, 020327 (2022).\n&nbsp\;
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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DTSTART:20221030T020000
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