Efficient Generation of Polarization-Entangled Photon Pairs with a Laser Diode Source

摘要: Entanglement, as E. Schrodinger called it “the essence of quantum mechanics”, is not only an essential ingredient effects but became also the most important resource information processing and communication. Entangled photon pairs, created initially by electron-positron annihilation later in atomic cascade decays, were first used distinctive comparisons various concepts mechanics [1,2]. More recently, parametric fluorescence (spontaneous down-conversion, SPDC) nonlinear optical crystals source entangled pairs [3–5] lead to a dramatic increase count rates experimental performance. This enabled variety experiments on foundations [6–8] realization new [9–11]. In spite that success, potential applications still suffer from low yield process. When our group joined chair Theodor Hansen about two years ago, was thus motivation for work optimize collection efficiency thereby available rate polarization-entangled down-conversion make useful real applications.