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SUMMARY:Chasing the Eighteenth Digit: Exploring the Limits of Timekeeping 
 - Dr Ian D. Leroux QUEST Institute for Experimental Quantum Metrology
DTSTART:20140403T140000Z
DTEND:20140403T150000Z
UID:TALK51777@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:The accuracy of state-of-the-art optical frequency standards b
 ased on trapped ions is now limited by relativistic effects\, principally 
 the time dilation due to the ions' thermal motion in the trap and uncertai
 nty on the gravitational red shift.  After a brief introduction to timekee
 ping and optical frequency standards in general\, I will discuss the poten
 tial of clocks to serve as gravitational potential sensors\, new laser-coo
 ling techniques to help control motional time-dilation shifts in ion traps
  at the level required for such relativistic geodesy\, and the role that q
 uantum entanglement may play in enhancing the performance of the next gene
 ration of frequency standards.
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, Department of Phys
 ics
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