18 May 2011 Biphoton compression in standard optical fiber
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Generation of two-photon light with given spectral and temporal properties is of great interest for quantum communication and quantum metrology applications. In particular, preparation of biphotons with ultra-narrow correlation time is a very important task. In a recent series of papers, our group analyzed the generation of twophoton wavepackets, produced by Spontaneous Parametric Down Conversion, in crystals with linearly chirped quasi-phase matching grating. Wavepackets present very broad spectra but a broad spectrum does not necessarily imply small correlation times, although the inverse is true. Indeed, the spectrum broadening induced by the grating is inhomogeneous; for this reason, the two-photon spectral amplitude present a phase (a frequency chirp) that depend nonlinearly on the frequency. Hence, the two-photon wavepackets are not Fourier transform-limited. As suggested in, the ideal way to make the wavepacket perfectly transform limited is to insert in the path of the biphotons a proper optical medium that compensates the non-linear part of the phase factor present in the spectral amplitude. In our work, we investigate the non-local temporal compression of the photons induced by the insertion of a standard optical fibre in the path of one of the two photons. We present and discuss a systematic study of this phenomenon and some optimal situation where the full numerical calculation shows an effect that can be clearly observed with a realistic set-up. The study has open the way to the practical realization of this idea.
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Giorgio Brida, Giorgio Brida, Maria Chekhova, Maria Chekhova, Ivo Pietro Degiovanni, Ivo Pietro Degiovanni, Marco Genovese, Marco Genovese, Galya Kitaeva, Galya Kitaeva, Alice Meda, Alice Meda, } "Biphoton compression in standard optical fiber", Proc. SPIE 8071, Nonlinear Optics and Applications V, 80710U (18 May 2011); doi: 10.1117/12.885450; https://doi.org/10.1117/12.885450

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