Ultrabright source of polarization-entangled photons
Ultrabright source of polarization-entangled photons
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DOI：
10.1103/physreva.60.r773
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发表时间：
1999-08-01
影响因子：
2.9
通讯作者：
Eberhard, PH
中科院分区：
文献类型：
--
作者：
Kwiat, PG;Waks, E;Eberhard, PH
利用双晶几何中的自发参数下转换过程，我们已经产生了一个偏振纠缠光子对的源，它的单位泵浦功率比以前的源要亮十倍以上，预计还可以再获得30到75倍的光。我们测量了在相对较大的收集角度和10 nm带宽上发射的光子之间的高度纠缠。作为源能力的演示，我们在不到三分钟的时间内获得了242西格玛违反贝尔不等式，并观察到当收集效率降低时，近乎完美的光子关联。此外，纠缠度和态纯度都应该是容易调节的。[S1050-2947(99)50108-X]。
Using the process of spontaneous parametric down-conversion in a two-crystal geometry, we have generated a source of polarization-entangled photon pairs that is more than ten times brighter, per unit of pump power, than previous sources, with another factor of 30 to 75 expected to be readily achievable. We have measured a high level of entanglement between photons emitted over a relatively large collection angle, and over a 10-nm bandwidth. As a demonstration of the source capabilities, we obtained a 242-sigma violation of Bell's inequalities in less than three minutes, and observed near-perfect photon correlations when the collection efficiency was reduced. In addition, both the degree of entanglement and the state purity should be readily tunable. [S1050-2947(99)50108-X].