Abstract
We present an experiment addressed to verify the validity of the entanglement quantifier R, defined as the ratio between single counts and coincidence distribution width for pure biphoton states ge-nerated by short pump pulses. We demonstrate that this ratio can be efficient to estimate entanglement degree in frequency domain. Our work has been performed with a femto second pulsed laser pump addressed to a LiIO3 crystal generating correlated biphotons through collinear degenerate type-I SPDC. To study the dependence of R on the length of the crystal we performed two sequence of measurements for each crystal firstly with a 10 mm and then with a 5 mm.
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Brida, G., Caricato, V., Genovese, M., Gramegna, M., Fedorov, M.V., Kulik, S.P. (2010). Entanglement Degree Characterization of Spontaneous Parametric-Down Conversion Biphotons in Frequency Domain. In: Sergienko, A., Pascazio, S., Villoresi, P. (eds) Quantum Communication and Quantum Networking. QuantumComm 2009. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 36. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11731-2_6
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DOI: https://doi.org/10.1007/978-3-642-11731-2_6
Publisher Name: Springer, Berlin, Heidelberg
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