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A recent theoretical paper [1] proposes a scheme for entanglement swappingutilizing acousto-optic modulators without requiring a Bell-state measurement.In this comment, we show that the proposal is flawed and no entanglementswapping can occur without measurement.Comment: 6 pages, 2 figures submitted to Phys. Rev

Comment on “Manipulating the frequency-entangled states by an acoustic-optical modulator”