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We investigate how to effectively preserve the entanglement between twononinteracting multilevel oscillators coupled to a common reservoir undernon-ideal pulse control. A universal characterization using fidelity isdeveloped for the behavior of the system based on Nakajima-Zwanzig projectionoperator technique. Our analysis includes the validity of the approximationmethod and the decoherence-suppression by the non-ideal pulse control. Thepower of our strategy for protecting entanglement is numerically tested,showing potential applications for quantum information processing.

Entanglement preservation for multilevel systems under non-ideal pulse control