1. Ultra-fast Hong-Ou-Mandel interferometry via temporal filtering
- Author
-
Masahide Sasaki, Yoshiaki Tsujimoto, Masahiro Takeoka, Kentaro Wakui, and Mikio Fujiwara
- Subjects
Physics ,Quantum Physics ,Photon ,business.industry ,FOS: Physical sciences ,Quantum channel ,Laser pumping ,Atomic and Molecular Physics, and Optics ,Interferometry ,Optics ,Mode-locking ,Interference (communication) ,Photonics ,Quantum Physics (quant-ph) ,business ,Spectral purity - Abstract
Heralded single photons (HSPs) generated by spontaneous parametric down-conversion (SPDC) are useful resource to achieve various photonic quantum information processing. Given a large-scale experiment which needs multiple HSPs, increasing the generation rate with suppressing higher-order pair creation is desirable. One of the promising ways is to use a pump laser with a GHz-order repetition rate. In such a high repetition rate regime, however, single-photon detectors can only partially identify the pulses. Hence, we develop a simple model to consider that effect on the spectral purity, and experimentally demonstrate a high-visibility Hong-Ou-Mandel interference between two independent HSPs generated by SPDC with 3.2 GHz-repetition-rate mode-locked pump pulses. The observed visibility of 0.88(3) is in good agreement with our theoretical model., 11 pages, 6 figures
- Published
- 2021