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The ability to engineer various quantum states of light is a central requirement for quantum information processing, including quantum communication, computing and metrology. In this endeavor, many experiments use the so-called conditional preparation technique. The dynamic of the heralded states, i.e. its temporal mode, mainly depends on the setup and has been studied theoretically with different...
Quantum information has reached a stage where real-world applications stimulate an intense research for the implementation of reliable and practical protocols for quantum communication and information processing. The implementation of such protocols, though, requires distributing quantum correlations (entanglement) among a number of degrees of freedom (modes) increasing with the complexity of the...
Correlations of twin beams generated by parametric down-conversion are quantitatively determined by two-photon counting interferometery. Compared with incoherent light, photon extrabunching at the fs scale is unambiguously and precisely measured.
We use a modified Hanbury Brown-Twiss set-up based on two-photon absorption to study second-order coherence of parametric fluorescence at the femtosecond scale. Characterizations are made in the degenerate case and far away degeneracy.
We show that photon quantum correlations can be measured by two photon absorption in semiconductors. Hanbury-Brown Twiss experiments can thus be performed with genuine blackbodies with a time resolution in the femtosecond range.
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