A practical model gives exact (four-PNR) and approximate (other configurations) effective density matrices for entangled photon pairs, finding four detectors exceed two while PNR offers no advantage at low efficiency.
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Developing a practical model for noise in entangled photon detection
A practical model gives exact (four-PNR) and approximate (other configurations) effective density matrices for entangled photon pairs, finding four detectors exceed two while PNR offers no advantage at low efficiency.