Study on the quantum coherent properties of entangled bi-photon with a pulse pump
3LI Bai-hong1， WANG Zhao-hua1， WANG Lei1， LI Jun2， LIAO Gui-sheng2， LI Yong-fang1*
(1 College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, Shaanxi, China; 2 National Lab of Radar Signal Processing, Xidian University, Xi′an 710071, Shaanxi, China)
Abstract:
Based on the nonlinear optics and quantum theory,the wave function and the correlated properties of entangled bi-photon with spontaneous type-Ⅱ parametric down-conversion pumped by a pulse laser are analyzed.The quantum coherent properties of entangled bi-photon are investigated and compared with that of the bi-photon pumped by a continuous wave (CW) laser. The evolution regularity of the second-order correlation function and average coincidence counting rate are obtained by numerical calculation.The results show that as increasing the pump band-width, the asymmetry of the phase-matching function is increased,and then the coherence (distinguishability)of entangled bi-photon and quantum interference visibility are diminished.
KeyWords:
entangled bi-photon；second-order correlation function ;quantum interference; pulse laser
