Title :
Characterization of coincident-frequency entangled source in quantum synchronization application
Author :
Dong Ruifang ; Quan Runai ; Hou Feiyan ; Wang Mengmeng ; Tai Zhaoyang ; Liu Tao ; Zhang Shougang
Author_Institution :
Key Lab. of Time & Freq. Primary Stand., NTSC, Xi´an, China
Abstract :
The frequency entangled photon pairs generated via spontaneous parametric down-conversion process (SPDC) have been found the main resources in quantum clock synchronization protocols. The spectral indistinguishibility of the photon pairs is a key factor for the achievement of quantum clock synchronization. In this paper, we characterize both theoretically and experimentally the factors degrading the spectral indistinguishibility of the generated coincident-frequency entangled photon pairs under extended phase matching conditions. The results show that due to the nonnegligible second-order dispersion contribution to the phase mismatching, the broadening of the pulse pump bandwidth and the lengthening of the nonlinear crystal all lead to the degradation.
Keywords :
atomic clocks; optical dispersion; optical frequency conversion; optical pumping; protocols; quantum entanglement; quantum optics; spectral line broadening; synchronisation; coincident frequency entangled source; frequency entangled photon pair generation; nonlinear crystal lengthening; nonnegligible second order dispersion; phase mismatching; pulse pump bandwidth broadening; quantum clock synchronization protocol; spectral indistinguishibility; spontaneous parametric down conversion process; Bandwidth; Crystals; Frequency conversion; Laser excitation; Photonics; Synchronization; Temperature measurement; HOM interferometric measurement; coincident-frequency entanglement; spectral indistinguishibility;
Conference_Titel :
Frequency Control Symposium (FCS), 2014 IEEE International
Conference_Location :
Taipei
DOI :
10.1109/FCS.2014.6859841
