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使用脉冲光在室温下抽运一根长1 m 的高非线性光子晶体光纤, 产生了中心波长分别位于830 nm 和1411 nm的具有量子关联性的闲频与信号光子. 实验中闲频和信号通道的带宽分别是15 nm和35 nm. 对单通道光子计数率的拟合结果显示光子几乎全部来源于光纤中的自发四波混频过程, 未受到Raman散射噪声的影响. 当闲频和信号通道的光子产生率约为每脉冲0.0085个时, 测得符合计数率与随机符合计数率的比值为102, 接近理论极限, 不仅证明了光子对的低噪声性, 而且表明所产生的光子对本身具有窄带频谱特性, 因而实验中对其收集效率很高. 此外, 这种高纯度关联光子对还联接了不同波段, 在量子信息技术中有着潜在的应用.A one-meter-long high nonlinear photonic crystal fiber is pumped by laser pulse train at room temperature, and the generated correlated idler and signal photons are centred at 830 nm and 1411 nm, respectively. The full widths at half maximum of the broad band filters of the two channel are 15 nm and 35 nm, respectively. The fitting results of single channel photon counts reveal that almost all the photons originate from spontaneous four wave mixing and the influence of Raman scattering is eliminated. When the production rate is 0.0085 photon per pulse, the ratio between coincidence rate and accidental coincidence rate is measured to be 102, which not only confirms the low noise property of the photon pair, but also shows that the photon pair are naturally narrow band, and the collecting efficiency in our experiment is high. Moreover, these high purity photon pairs connect different optical bands, and have potential applications in quantum information technologies.
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[1] Gisin N, Ribordy G G, Tittel W, Zbinden H 2002 Rev. Mod. Phys.74 145
[2] Knill E, Laflamme R, Milburn G J 2001 Nature 409 46
[3] Fiorentino M, Voss P, Sharping J E, Kumar P 2002 IEEE PhotonicTech. Lett. 14 983
[4] Sharping J E, Chen J, Li X Y, Kumar P, Windeler R S 2004 Opt.Express 12 3086
[5] Yang L, Li X Y, Wang B S 2008 Acta Phys. Sin. 57 4933 (inChinese)[杨磊, 李小英, 王宝善 2008 57 4933]
[6] Agrawal G P 2001 Nonlinear Fiber Optics (San Diego: AcademicPress) p298
[7] Cui L, Li X Y, Fan H Y, Yang L, Ma X X 2009 Chin. Phys. Lett.26 044209
[8] Rarity J, Fulconis J, Duligall J, Wadsworth W J, Russell P 2005Opt. Express 13 534
[9] Alibart O, Fulconis J, Wong G K L, Murdoch S G, Wadsworth WJ, Rarity J G 2006 New J. Phys. 8 67
[10] Fan J, Migdall A, Wang L J 2005 Opt. Lett. 30 3368
[11] Wong G K, Chen A Y, Ha S, Kruhlak R, Murdoch S, LeonhardtR, Harvey J, Joly N 2005 Opt. Express 13 8662
[12] Li X Y, Ma X X, Quan L M, Yang L, Cui L, Guo X S 2010 J. Opt.Soc. Am. B 27 1857
[13] Song Y J, Hu M L, Liu B W, Chai L, Wang Q Y 2008 Acta Phys.Sin. 57 6425 (in Chinese)[宋有建, 胡明列, 刘博文,柴路, 王清月 2008 57 6425]
[14] Cui L, Li X Y, Zhao N B 2012 arXiv:1202.0376 [quant-ph]
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