Figure 1 (a) Conventional entanglement swapping and (b) SFG-based entanglement swapping (IMAGE)

National Institute of Information and Communications Technology (NICT)

Figure 1 (a) Conventional entanglement swapping and (b) SFG-based entanglement swapping

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Figure 1 (a) Conventional entanglement swapping and (b) SFG-based entanglement swapping

a When photon-pair generation is probabilistic, a two-photon interference measurement between A2 and B1 alone cannot distinguish successful events from unsuccessful ones. Therefore, additional measurements are required to verify the presence of one photon each in modes A1 and B2.

b  When the SFG photon is detected, it indicates that there is one photon in each of modes A2 and B1, allowing the successful entanglement swapping event to be identified.

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National Institute of Information and Communications Technology (NICT)

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