Miniaturizing quantum photonics is a rapidly growing field. We introduced a concept of microcavity standing-wave nonlinear optics theoretically and experimentally, where the phasematching requirement is translated into a nonlinear mode overlap.
We demonstrated experimentally the first observation of two-photon emission in semiconductors - a process, in which electron transition between energy levels occurs by the emission of a photon pair. We proposed this phenomenon as an electrically-driven room-temperature source of energy-entangled photons, much more efficient than the down-conversion schemes. We also proposed two-photon absorption interferometry for characterization of energy qubits.
First observations of electrically-induced two-photon transparency and two-photon gain in semiconductors are demonstrated experimentally, and a scheme for a femtosecond-scale g (4) measurement is implemented.
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