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Single-photon entanglement is one of the primary resources for quantumnetworks, including quantum repeater architectures. Such entanglement can berevealed with only local homodyne measurements through the entanglement witnesspresented in [Morin et al. Phys. Rev. Lett. 110, 130401 (2013)]. Here, weprovide an extended analysis of this witness by introducing analytical boundsand by reporting measurements confirming its great robustness with regard tolosses. This study highlights the potential of optical hybrid methods, wherediscrete entanglement is characterized through continuous-variablemeasurements.

Witnessing single-photon entanglement with local homodyne measurements: analytical bounds and robustness to losses