An all fiber source of frequency entangled photon pairs
Xiaoying Li, Lei Yang, Xiaoxin Ma, Liang Cui, Zhe Yu Ou, Daoyin Yu
TL;DR
This paper reports an all fiber-based source of frequency entangled photon pairs using four wave mixing in a Sagnac fiber loop, achieving high interference visibility and suppressing impurity effects.
Contribution
It introduces a novel fiber-based method for generating high-quality frequency entangled photon pairs with improved purity and interference visibility.
Findings
Quantum interference with 95% visibility observed
Photon pair production rate of 0.013 pairs/pulse achieved
Effective suppression of frequency entanglement impurity
Abstract
We present an all fiber source of frequency entangled photon pairs by using four wave mixing in a Sagnac fiber loop. Special care is taken to suppress the impurity of the frequency entanglement by cooling the fiber and by matching the polarization modes of the photon pairs counter-propagating in the fiber loop. Coincidence detection of signal and idler photons, which are created in pair and in different spatial modes of the fiber loop, shows the quantum interference in the form of spatial beating, while the single counts of the individual signal (idler) photons keep constant. When the production rate of photon pairs is about 0.013 pairs/pulse, the envelope of the quantum interference reveals a visibility of , which is close to the calculated theoretical limit 97.4%
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