Ultrabroadband biphotons generated via chirped quasi-phase-matched optical parametric down-conversion |
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| Authors: | Nasr Magued B Carrasco Silvia Saleh Bahaa E A Sergienko Alexander V Teich Malvin C Torres Juan P Torner Lluis Hum David S Fejer Martin M |
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| Institution: | Quantum Imaging Laboratory, Department of Electrical & Computer Engineering, Boston University, Boston, Massachusetts 02215, USA. |
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| Abstract: | We generate ultrabroadband biphotons via the process of spontaneous parametric down-conversion (SPDC) in quasi-phase-matched nonlinear gratings that have a linearly chirped wave vector. By using these ultrabroadband biphotons (300-nm bandwidth), we measure the narrowest Hong-Ou-Mandel dip to date, having a full width at half maximum of 7.1 fs. This enables the generation of a high flux of nonoverlapping biphotons with ultrabroad bandwidth, thereby promoting the use of SPDC light in many nonclassical applications. |
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