Biphoton compression in standard optical fiber

Giorgio Brida; Maria Chekhova; Ivo Pietro Degiovanni; Marco Genovese; Galya Kitaeva; Alice Meda

doi:10.1117/12.885450

18 May 2011 Biphoton compression in standard optical fiber

Giorgio Brida, Maria Chekhova, Ivo Pietro Degiovanni, Marco Genovese, Galya Kitaeva, Alice Meda

Proceedings Volume 8071, Nonlinear Optics and Applications V; 80710U (2011) https://doi.org/10.1117/12.885450
Event: SPIE Optics + Optoelectronics, 2011, Prague, Czech Republic

Abstract

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.

Citation Download Citation

Giorgio Brida, Maria Chekhova, Ivo Pietro Degiovanni, Marco Genovese, Galya Kitaeva, and Alice Meda "Biphoton compression in standard optical fiber", Proc. SPIE 8071, Nonlinear Optics and Applications V, 80710U (18 May 2011); https://doi.org/10.1117/12.885450

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