Abstract
Entangled two-photon spectroscopy promises to outperform classical spectroscopy. It is based on the fact that energy-time entangled photons possess simultaneously broadband and narrowband features. When pumped by a narrowband laser, photon pairs produced by spontaneous parametric down-conversion (SPDC) can show strong correlations in energy. On one hand the energies of both photons from the pair sum up to the energy of the pump laser, which is well defined. On the other hand the energy of each photon from the pair can take a value from a broad spectrum, depending on the phase matching in the SPDC process [1]. It has been theoretically shown, that using such quantum light for spectroscopy, allows to reveal spectroscopic features not accessible with classical light [2]. Whereas there is no fundamental limit in classical spectroscopy to the light intensity (the number of photons) used to probe matter, the flux of entangled photons is limited. If the number of emitted photon pairs per unit time is too large, the pairs start to overlap temporally such that it is not possible to distinguish them, thus reducing the quantum advantage [3].
© 2015 IEEE
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