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Аннотация:Generated via parametric down-conversion (PDC), the quantum-correlated biphoton pairs are successfully used in modern quantum optics as a source of entangled photons and squeezed vacuum states. However, they can occupy considerably wider spectral range, including optical signal photons and terahertz-frequency idler photons emitted in strongly frequency non-degenerate PDC regime. Particular quantum properties of this regime, as well as results of our recent experiments on registration of signal optical photons and corresponding idler terahertz wave photons are discussed.