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Graduate Student Seminar - 11/7/2014

"All-Optical Coherent Control of Vacuum Rabi Oscillations"

by Tao Cai

Friday, November 7, 2014 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Associate Professor Edo Waks

When an atom strongly couples to a cavity, it can undergo vacuum Rabi oscillations that coherently transfer energy between an atomic excitation and a photon.  Controlling these oscillations is challenging because it requires modulating the atom-cavity interaction quickly compared to the vacuum Rabi frequency.   This control has been achieved at microwave frequencies, but has remained challenging to implement in the optical domain.  Here, we demonstrate coherent transfer of an optical frequency photon between a quantum dot and a cavity by controlling vacuum Rabi oscillations.  We utilize a photonic molecule to simultaneously attain strong coupling and a cavity-enhanced AC Stark shift.  The Stark shift modulates the coupling between the two systems on picosecond timescales, faster than the vacuum Rabi frequency.  We demonstrate the ability to add and remove excitation from the cavity, and perform coherent control of light-matter states.  These results enable ultra-fast control of atom-cavity interactions in a nanophotonic device platform.

For additional information about the IREAP Graduate Student Seminars, contact Joe Garrett, David Somers or Joe Murray.

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