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

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arxiv 1406.0381 v2 pith:YYHQ5CF5 submitted 2014-06-02 quant-ph

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

classification quant-ph
keywords entanglementmeasurementsanalyticalboundshomodynelocallossesquantum
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Single-photon entanglement is one of the primary resources for quantum networks, including quantum repeater architectures. Such entanglement can be revealed with only local homodyne measurements through the entanglement witness presented in [Morin et al. Phys. Rev. Lett. 110, 130401 (2013)]. Here, we provide an extended analysis of this witness by introducing analytical bounds and by reporting measurements confirming its great robustness with regard to losses. This study highlights the potential of optical hybrid methods, where discrete entanglement is characterized through continuous-variable measurements.

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