title: A coherence preservation control strategy in cavity QED based on classical quantum feedback.
abstract: For eliminating the unexpected decoherence effect in cavity quantum electrodynamics (cavity QED), the transfer function of Rabi oscillation is derived theoretically using optical Bloch equations. In particular, the decoherence in cavity QED from the atomic spontaneous emission is especially considered. A feedback control strategy is proposed to preserve the coherence through Rabi oscillation stabilization. In the scheme, a classical quantum feedback channel for the quantum information acquisition is constructed via the quantum tomography technology, and a compensation system based on the root locus theory is put forward to suppress the atomic spontaneous emission and the associated decoherence. The simulation results have proved its effectiveness and superiority for the coherence preservation.
authors.affiliation: School of Automation, Guangdong University of Technology, No. 100 Waihuan Xi Road, Guangzhou Higher Education Mega Center, Pan Yu District, Guangzhou, Guangdong, China. mingli4@mail.ustc.edu.cn
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Junli
authors.initials: J
authors.lastname: Gao
mesh_terms: D003198:Computer Simulation; D039301:Computers, Molecular; D005246:Feedback; D008962:Models, Theoretical; D011789:Quantum Theory