Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Posters: Quantum Optics and Photonics I
Q 13.58: Poster
Monday, March 9, 2020, 16:30–18:30, Empore Lichthof
The discrete and continuous fractional Fourier transform applied to entangled two-photon states — •Malin Kück1,2, Kurt Busch1,2, and Armando Perez-Leija1,2 — 1Humboldt-Universität zu Berlin — 2Max-Born-Institut, Berlin
Spontaneous parametric down-conversion (SPDC) is a nonlinear optical process that takes place in birefringent crystals where high-energy pump photons are converted into pairs of low-energy signal and idler photons. Depending on the crystal shape and the pump field the emerging photon pairs may exhibit a certain degree of correlation. In this contribution we use the fractional Fourier transform to externally tailor the correlations of photon pairs generated in SPDC sources. We show that arbitrary degrees of intensity correlations can be obtained by applying the Fourier transform of fractional orders to the output states of SPDC sources. In doing so, we compute the dynamics of two-photon light traversing discrete and continuous fractional Fourier transformers, that is, waveguide arrays and GRIN optical media. Moreover, we consider different entanglement criteria to characterize the evolving photon pairs.