华怡林-量子信息-墙报.pdf
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1、Photon-pair generated by spontaneous parametric down-conversion(SPDC)entangled in the degree of freedom of orbital angular momentum(OAM).1958aniUhnCi vfeor syigtyol oofn ShccieeTn cde anAn annual-ring type quasi-phase-matching crystal for generation of narrow-band high-dimensional entanglment1111Yi-
2、Lin Hua,Zong-Quan Zhou,Chuan-Feng Li,and Guang-Can Guo1.Key Laboratory of Quantum Information,University of Science and Technology of China,CAS,Hefei,230026IntroductionConclusionsThis entanglement is naturally wide-band,hard to be applied in quantummemories and other tasks of quantum information.We
3、notice that narrow-band entanglement can be realized by optical filtering,but the high-order modes will decrease dramatically because of phase mismatching.Design of quasi-phase matching(QPM)grating can eliminate the phase mismatching.The dimensionality of the entanglement can be greatlyenhanced and
4、the quality of entanglement can be improved effectively=2p0=p0=1/2p0Narrow band dilemmaDesigns of QPM crystalEffect of design Diagram of the cross-section views of two special designs of the quasi-phase-matching grating.We only display right half part the QPM grating.The structures are circularly sy
5、mmetric as shown by the circular structures on both sides so the rectangles in the middle are cylinders as a matter of fact.Only a few orders of modes are shown in the designs,but actually the designs can support quite wide range of modes.(a)Accurate design of QPM crystal(b)Approximate design of QPM
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- 华怡林 量子 信息 墙报
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