Open AccessFrequency indistinguishibility investigation of generated coincident-frequency entanglement via ultra-fast pulsed sources
Author(s) -
Yu Zhang,
Runai Quan,
Yun Bai,
Feiyan Hou,
Tao Liu,
Shougang Zhang,
Ruifang Dong
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.144206
Subject(s) - quantum entanglement , physics , optics , spontaneous parametric down conversion , broadband , bandwidth (computing) , coincidence , quantum optics , quantum , quantum mechanics , telecommunications , computer science , medicine , alternative medicine , pathology
The frequency entangled biphoton source generated via spontaneous parametric down-conversion process (SPDC) has found numerous applications in quantum information processing and relevant fields. We report on an experimental generation of coincident-frequency entanglement from periodically poled potassium titanyl phosphate, pumped by an ultra-short pulsed optical source with duration less than 20 fs. Based on the Hong-Ou-Mandel interferometric coincidence measurement setup, a visibility of about 42% is demonstrated, which indicates degraded frequency indistinguishibility of the down-converted biphotons. Through theoretical investigation, such a degradation can be perfectly explained by the nonnegligible second-order dispersion terms in the Taylor-expanded phase mismatching function for the case of ultra-broadband spectrum of the pulsed pump. The fitting to the experimental results is further used and perfect agreement is achieved. The results imply that the spectral bandwidth of the pump can affect the generated coincident-frequency entanglement.