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SUMMARY: Architectures for ion quantum technology - Dr. Winfried K. Hensin
 ger\, Ion Quantum Technology Group\,Department of Physics and Astronomy\, 
 University of Sussex\, United Kingdom
DTSTART:20061009T131500Z
DTEND:20061009T141500Z
UID:TALK5494@talks.cam.ac.uk
CONTACT:K DAS GUPTA
DESCRIPTION:Quantum theory can have powerful applications due to the possi
 bility of\nimplementing new quantum technologies such as the quantum compu
 ter. While\nsuch a device could have very important commercial and nationa
 l security\napplications due to the existence of quantum factoring algorit
 hms\, its\nexistence could revolutionize modern day science by allowing tr
 ue quantum\nsimulations of systems that may be modelled classically only i
 nsufficiently\ndue to an in-principle limitation of current computer techn
 ology. Recent\ndevelopments in ion trapping technology show that it should
  be possible to\nimplement quantum technology with trapped ions. Trapped i
 on quantum\ntechnology has already been successfully applied in experiment
 s with a token\nnumber of quantum bits\, for example to realize quantum al
 gorithms such as\nsearch\, the generation of particular entangled states o
 f up to 8 ions\,\nteleportation\, ion-photon entanglement\, error correcti
 on and others. In\norder to build useful devices\, the next step must incl
 ude the systematic\ndevelopment of suitable architectures for large scale 
 ion quantum technology\napplications.\n\nIn this talk I will discuss pathw
 ays how such architectures may be realized\nand recent progress that has b
 een made\, particularly focusing on recent\nexperiments at the University 
 of Michigan. The scalable fabrication of ion\ntrap arrays involves advance
 d nanofabrication techniques including\nphotolithography. A first step has
  been made with the successful\nimplementation of an integrated ion chip e
 tched in a multi-layer\nGallium-Arsenide substrate. Shuttling ions in mult
 idimensional structures\nwill likely form an important tool for the interc
 hange of quantum\ninformation. Recently we demonstrated full two-dimension
 al control including\nthe controlled .three-point-turn. of two ions in a .
 T-junction. array. I\nwill show a perspective of the work that still needs
  to be carried out in\norder to produce practical devices and highlight th
 e importance of the\ncondensed matter . atomic physics interface. I will a
 lso discuss a recent\nmeasurement of the scaling of motional heating from 
 the quantum ground state\nin an ion trap with moveable electrodes\, the de
 monstration of significant\nsuppression of anomalous patch potential heati
 ng\, and the demonstration of\nan ion trap with 23 microns ion-electrode s
 pacing.\n\nFinally\, I will mention a proposal to explore the quantum natu
 re of\nnanomechanical devices using single trapped ions as a transducer. W
 hile an\nion may be used to cool the cantilever down to its lowest motiona
 l quantum\nstate via sympathetic cooling\, one could also envision couplin
 g both systems\nin the quantum domain. The quantum state of the ion may be
  transferred onto\nthe cantilever and cantilever and ion could be entangle
 d.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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