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Tanabe et al (Phys. Rev. A {\bf 82} 040101(R) 2010) have experimentallydemonstrated that the emission properties of unstable atoms in entangled andproduct states are different. The authors define an apparent decay time as afitting parameter which falls below the lifetime of the single atom forentangled pairs. We argue that their results about coincidence time spectra arecorrect, but those concerning lifetimes cannot be considered conclusive becausethey assume the emission of photons by the two atoms to be independentprocesses, a doubtful hypothesis for entangled states. We suggest an improvedevaluation of the lifetimes based on a rigorous approach, which demands somemodifications of the experimental procedure.

Comment on "Effect of entanglement on the decay dynamics of a pair of H(2p) atoms due to spontaneous emission"