Comment on “Manipulating the frequency-entangled states by an acoustic-optical modulator”
Katharina Resch, Stefan H. Myrskog, Jeff S. Lundeen, Aephraim M. Steinberg · Physical Review A · 2001
A recent theoretical paper by Shi et al. [Phys. Rev. A 61, 064102 (2000)] proposes a scheme for entanglement swapping utilizing acousto-optic modulators without requiring a Bell-state measurement. In this Comment, we show that the proposal is flawed and no entanglement swapping can occur without measurement.