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We demonstrate a new technique of efficient, time-resolved, infrared single-photon detection using non collinearly phase-matched frequency upconversion by an ultrafast pump, allowing nearly background-free sub-picosecond characterization of 1582-nm time anti-correlated entangled photons.
We implement entanglement concentration by the Schmidt projection protocol, known for its optimal efficiency for large number of qubits, using photon pairs entangled in polarization and momentum and employing single-photon two-qubit quantum logic.
We show in theory that the down-converted photon-pairs carry extrinsic orbital angular momentum in the degrees of freedom of relative movement of one photon with respect to its twin in type-II spontaneous parametric down-conversion.
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