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Phys Rev Lett. 2008 May 9;100(18):183601. Epub 2008 May 5.

Ultrabroadband biphotons generated via chirped quasi-phase-matched optical parametric down-conversion.

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Quantum Imaging Laboratory, Department of Electrical & Computer Engineering, Boston University, Boston, Massachusetts 02215, USA.

Erratum in

  • Phys Rev Lett. 2008 May 16;100(19):199903.


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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