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S. Longhi [1] studied the survival probability P(t) of an unstable statecoupled to a tight-binding lattice finding an exact analytical solution thatdescribes the nonexponential decay. When the first coupling is smaller than theothers, he shows that P(t) has a natural decomposition into two terms; one isthe exponential decay, consistent with the Gamow's approach, and the other isthe correction to this decay. The first purpose of this Comment is to show thatthe condition imposed on the system; the site energy of the first site is setin the center of the band, limits the generality of the results. Adecomposition based on the spectral properties of the system removes thisrestriction [2]. Other point of this Comment is that, for the weak couplinglimit, the author stated that a Zeno effect occurs for t less than t*, where t*is the smallest root of the equation g_eff(t*)=g_0, and for the strong couplinglimit an anti-Zeno effect occurs for t close to t**, where t** is the firstpeak of g_eff. By using a spectral formulation we show that, the anti-Zenoeffect not only requires a strong coupling limit, also is necessary to choosethe resonance energy and width such that a destructive interference can occur.We present this interference and give an analytical expression and physicallyinterpretation for t* and t**.

Comment on "Nonexponential Decay Via Tunneling in Tight-Binding Lattices and the Optical Zeno Effect"