Entropy- and purity-tailored broadband entanglement from vectorial four-wave mixing: Insights from pulse modes and classical-field dynamicsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 11 ноября 2019 г.
Аннотация:We present a time-domain Schmidt-mode analysis of a broadband continuous-variable entanglement ofphoton pairs generated via a vectorial four-wave mixing (FWM) of ultrashort laser pulses in a highly nonlinearbirefringent optical fiber. We demonstrate that the time-domain eigenmodes of high-purity two-photon statesgenerated through vectorial FWM can be steered, by varying the pump wavelength and FWM polarizationgeometry, from a high-purity entangled ket to a high-entropy entangled state in a space of a very highdimensionality. Moreover, this pulse-mode analysis is shown to provide a clear physical perspective on howthe entanglement structure of two-photon states builds up as a result of short-pulse FWM dynamics. This insightreveals a correspondence-type relation between the quantum and classical pictures of photon-pair generation.With an eye on practical applications, a clear understanding of the temporal profile of pulse modes representinghigh-purity two-photon states is central to a meaningful shaping of ultrashort photon-packet waveforms forsuper-resolving microscopy and multiphoton spectroscopy using quantum states of light.