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We study two two-level systems (TLSs) interacting with a reservoir of guidedmodes confined in a rectangular waveguide. For the energy separation of theidentical TLSs far away from the cutoff frequencies of transverse modes, thedelay-differential equations are obtained with single excitation initial in theTLSs. The effects of the inter-TLS distance on the time evolution of theconcurrence of the TLSs are examined.

Concurrence of Two Identical Atoms in a Rectangular Waveguide: Linear Approximation with Single Excitation