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Quantum Information Processing

High fidelity and flexible quantum state transfer in the atom-coupled cavity hybrid system

B. F. C. Yabu-uti, José Antonio Roversi

Published Feb 4, 2012• 11 citations
Publisher
DOI
10.1007/s11128-012-0366-y

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We investigate a system composed of NNN coupled cavities and two-level atoms interacting one at a time. Adjusting appropriately the atom-field detuning, and make the hopping rate of photons between neighboring cavities, AAA, greater than the atom-field coupling ggg (i.e. A>>gA>>gA>>g), we can eliminate the interaction of the atom with the nonresonant normal modes reducing the dynamics to the interaction of the atom with only a single-mode. As an application of this interaction, we analyze the transmission of an arbitrary atomic quantum state between distant coupled cavities. In the ideal case, we obtain a flexible and perfect quantum communication. Considering the influence of dissipation an interesting parity effect emerge and we obtain NNN maximum in which it is still possible to achieve a quantum communication more efficient than a purely classical channel between the ends. We also studied important sources of imperfections in procedure execution.