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SUMMARY:Laser cooling and trapping of ions\, atoms and molecules - Dr Hami
 d Ohadi (University of Southampton)
DTSTART:20100309T140000Z
DTEND:20100309T150000Z
UID:TALK23379@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:In the first part of this talk I report on work aimed towards 
 realising Quantum Information\nProcessing with single 40Ca+ ions in a Penn
 ing trap\, where trapping is achieved using static\nelectric and magnetic 
 fields. Unlike RF traps\, in the Penning trap there is no heating due\nto 
 micromotion. Therefore the qubit should in principle have a longer decoher
 ence time.\nHowever due to the Zeeman splitting of the levels\, more laser
 s and also a stable magnetic\nfield are usually needed.\nIn the second par
 t two related schemes for trapping and cooling of atoms and molecules\nin 
 micron-size mirror arrays are presented. We investigate micro-mirror trapp
 ing using the\ndipole force and micro-MOTs with permanent magnets in array
 s of hemispherical mirrors\,\nwhich are made in house using “wet chemist
 ry” electroplating. In our experiment Rb atoms\nare first trapped in a m
 agneto-optical trap close to the surface and then released onto the\nhemis
 pherical mirrors.\nIn the third part mirror-mediated cooling will be brief
 ly mentioned. Mirror-mediated\ncooling is an off-resonant laser cooling te
 chnique similar to cavity-mediated cooling but\nusing only a single mirror
 . In this technique the light’s time delay between the particle and\nits
  mirror image could result in a friction force.\n[1] D. Crick\, H. Ohadi\,
  I. Bhatti\, R.C. Thompson and D.M. Segal\, Optics Express 16:2351 (2007)\
 n[2] H. Ohadi\, M. Himsworth\, A. Xuereb and T. Freegarde Optics Express 1
 7:23003 (2009)\n[3] A. Xuereb\, P. Horak and T. Freegarde\, Phys Rev A 80:
 013836 (2009)\n[4] P. N. Bartlett\, P. R. Birkin and M. A. Ghanem\, Chem. 
 Commun. 1671 (2000)
LOCATION:Rutherford building\, Seminar Room B
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