Saravi Sina, Pertsch Thomas, Setzpfandt Frank
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Strasse 6, 07745 Jena, Germany.
Phys Rev Lett. 2017 May 5;118(18):183603. doi: 10.1103/PhysRevLett.118.183603. Epub 2017 May 3.
We propose the use of nonlinear periodic waveguides for direct and fully integrated generation of counterpropagating photon pairs by spontaneous parametric down-conversion. Using the unique properties of Bloch modes in such periodic structures, we furthermore show that two counterpropagating phase-matching conditions can be fulfilled simultaneously, allowing for the generation of path-entangled Bell states in a single periodic waveguide. To demonstrate the feasibility of our proposal, we design a photonic crystal slab waveguide made of lithium niobate and numerically demonstrate Bell-state generation.
我们提出使用非线性周期波导，通过自发参量下转换直接且完全集成地产生反向传播的光子对。利用此类周期结构中布洛赫模式的独特性质，我们进一步表明，可以同时满足两个反向传播的相位匹配条件，从而能够在单个周期波导中产生路径纠缠的贝尔态。为了证明我们方案的可行性，我们设计了一种由铌酸锂制成的光子晶体平板波导，并通过数值模拟证明了贝尔态的产生。
