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Focusing the pump in type-II SPDC not only increases the efficiency of photon collection with single-mode fibers, but also increases the spatial distinguishability of the photons, in some cases reducing the polarization entanglement.
The Fuchs-Peres-Brandt (FPB) probe realizes the most powerful individual attack on BB84 quantum key distribution. A physical simulation of the FPB-probe attack using single-photon two-qubit quantum logic is described.
We demonstrate a simple, robust, high-flux source of polarization-entangled photons based on a polarization Sagnac interferometer, measuring 5000 polarization-entangled pairs/s/mW of pump power in a 1-nm bandwidth with 96.8% quantum-interference visibility.
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