Related Experiment Video
Updated: Jul 1, 2026
A Multimodal Wide-Field Fourier-Transform Raman Microscope
Published on: December 30, 2025
Submicron axial resolution in an ultrabroadband two-photon interferometer using superconducting single-photon
Magued B Nasr1, Olga Minaeva, Gregory N Goltsman
1Departments of Electrical & Computer Engineering and Physics, Quantum Imaging Laboratory, Boston University, Boston, MA 02215, USA. boshra@bu.edu
Abstract:
We generate ultrabroadband biphotons via the process of spontaneous parametric down-conversion in a quasi-phase-matched nonlinear grating that has a linearly chirped poling period. Using these biphotons in conjunction with superconducting single-photon detectors (SSPDs), we measure the narrowest Hong-Ou-Mandel dip to date in a two-photon interferometer, having a full width at half maximum (FWHM) of approximately 5.7 fsec. This FWHM corresponds to a quantum optical coherence tomography (QOCT) axial resolution of 0.85 ?m. Our results indicate that a high flux of nonoverlapping biphotons may be generated, as required in many applications of nonclassical light.
