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Feedback in a cavity QED system for control of quantum beats | | A.D. Cimmarusti
; B.D. Patterson
; C.A. Schroeder
; L.A. Orozco
; P. Barberis-Blostein
; H.J. Carmichael
; | | Date: |
18 Sep 2013 | | Abstract: | Conditional measurements on the undriven mode of a two-mode cavity QED system
prepare a coherent superposition of ground states which generate quantum beats.
The continuous system drive induces decoherence through the phase interruptions
from Rayleigh scattering, which manifests as a decrease of the beat amplitude
and an increase of the frequency of oscillation. We report recent experiments
that implement a simple feedback mechanism to protect the quantum beat. We
continuously drive the system until a photon is detected, heralding the
presence of a coherent superposition. We then turn off the drive and let the
superposition evolve in the dark, protecting it against decoherence. At a later
time we reinstate the drive to measure the amplitude, phase, and frequency of
the beats. The amplitude can increase by more than fifty percent, while the
frequency is unchanged by the feedback. | | Source: | arXiv, 1309.4792 | | Services: | Forum | Review | PDF | Favorites | |
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