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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20261027T225306Z
LAST-MODIFIED:20190619T154413Z
DTSTART:20190621T160000Z
DTEND:20190621T170000Z
UID:event2149@bu.edu
URL:http://physics.bu.edu/internal/events/show/2149
SUMMARY:Cavity mediated optical feedback to collective atomic motion and sp
	in
DESCRIPTION:Featuring Jonathan Kohler\, UC Berkeley\nHosted by: Alexander S
	ushkov\n\nPart of the Biophysics/Condensed Matter Seminar Series.\n\nUltrac
	old atoms coupled to optical cavities are an ideal system for studying quan
	tum measurement and control. Through sensitivity to the atomic state\, the 
	cavity field can apply coherent backaction\, modifying the dynamics of the 
	atomic ensemble. In addition\, photons leaking out of the cavity provide re
	al-time information about these dynamics. In this seminar\, I will introduc
	e our platform for measurement and autonomous feedback to the collective sp
	in and motion of an atomic ensemble within a high-finesse optical cavity. W
	e have demonstrated feedback stabilization of the atomic spin in its invert
	ed\, high-energy state\, where its dynamics can be described as an effectiv
	e negative-mass oscillator. I will present our further realization of a neg
	ative-mass instability\, generated by cavity-mediated collective spin-orbit
	 coupling in the atomic ensemble. The instability arises from a resonant pa
	ir-creation interaction between the effective negative-mass spin and the at
	omic center-of-mass motion\, and drives amplification and correlation of bo
	th modes. Finally\, I will describe ongoing work toward stabilization of no
	n-equilibrium spin states and preparation of sub-Poisson atomic ensembles t
	hrough cavity feedback.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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