Ultrabroadband biphotons generated via chirped quasi-phase-matched optical parametric down-conversion.
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.
Quantum Imaging Laboratory, Department of Electrical & Computer Engineering, Boston University, Boston, Massachusetts 02215, USA.
Magued B
MB
Nasr
Silvia
S
Carrasco
Bahaa E A
BE
Saleh
Alexander V
AV
Sergienko
Malvin C
MC
Teich
Juan P
JP
Torres
Lluis
L
Torner
David S
DS
Hum
Martin M
MM
Fejer