Control of conditional quantum beats in cavity QED: amplitude decoherence and phase shifts
Abstract
We implement a simple feedback mechanism on a two-mode cavity QED system to preserve the Zeeman coherence of a ground state superposition that generates quantum beats on the second-order correlation function. Our investigation includes theoretical and experimental studies that show how to prevent a shift away from the Larmor frequency and associated decoherence caused by Rayleigh scattering. The protocol consists of turning off the drive of the system after the detection of a first photon and letting it evolve in the dark. Turning the drive back on after a pre-set time reveals a phase accumulated only from Larmor precession, with the amplitude of the quantum beat more than a factor of two larger than with continuous drive.
Cite
@article{arxiv.1301.3000,
title = {Control of conditional quantum beats in cavity QED: amplitude decoherence and phase shifts},
author = {A. D. Cimmarusti and C. A. Schroeder and B. D. Patterson and L. A. Orozco and P. Barberis-Blostein and H. J. Carmichael},
journal= {arXiv preprint arXiv:1301.3000},
year = {2013}
}
Comments
17 pages, 9 figures