科研之友
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摘要
Nonclassical multi-photon and number states are attractive because of their wide applicability, and experimental generation of these states is a longstanding aim. We prepare photon triplets using a spontaneous Raman scattering process in a hot atomic ensemble cascaded by a spontaneous parametric downconversion process in a periodically poled nonlinear waveguide; strong temporal correlations are observed between the photons. This represents the first combination of nonlinear processes of different orders with different physical systems, and demonstrates the scheme's feasibility. The triplets exist in the telecommunications band, which is promising for testing of quantum mechanical laws for multi-photon entanglement over large distances.
- 出版日期2015-7-20
- 单位中国科学技术大学
