Generation of high-purity telecom-band entangled photon pairs in dispersion-shifted fiber |
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| Authors: | Lee Kim Fook Chen Jun Liang Chuang Li Xiaoying Voss Paul L Kumar Prem |
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| Affiliation: | Department of Electrical Engineering and Computer Science, Center for Photonic Communication and Computing, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA. kflee@ece.northwestern.edu |
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| Abstract: | We study the purity of correlated photon pairs generated in a dispersion-shifted fiber at various temperatures. The ratio of coincidence to accidental-coincidence counts greater than 100 can be obtained as the fiber is cooled to liquid-nitrogen temperature (77 K). We then generate polarization-entangled photon pairs by using a compact counterpropagating scheme. Two-photon interference with visibility >98% and Bell's inequality violation by >8 standard deviations of measurement uncertainty are observed at 77 K, without subtracting the accidental-coincidence counts due to background Raman photons. |
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