ITR: Twin Photons with Angular Momentum: Extending Entanglement for Quantum Information

双光子为量子光学提供了最强大的工具之一，用于探索粒子纠缠和信息隐形传态等现象，并为量子计算提供了更多可能的应用。在共轭光子系统的参数下转换过程中加入角动量纠缠可以将纠缠扩展到前所未有的程度。本工作的目的是扩展处于早期阶段的具有角动量的双光子的基础知识，并确定这些新思想应用于量子信息科学的可能性。具体计划包括以下内容。1)通过偶合实验验证理论预测的纠缠光子与角动量的角相关性。2)第二次重合实验将作为在光纤中可能应用的测试。3)同时纠缠于角动量和偏振态的光态，通过路径不可分辨的组合产生纠缠的偏振态和纠缠的角动量态之间的多重纠缠。实验工作将伴随着理论研究。

Twin photons have provided quantum optics with one of its most powerful tools to explore phenomena such as particle entanglement and the idea of teleportation of information, with additional glimpses of possible applications to quantum computation. Addition of angular momentum (AM) entanglement to the conjugated photon system in the parametric down conversion (PDC) process could extend entanglement to an unprecedented degree. It is the aim of this work to extend the fundamental knowledge on twin photons with angular momentum, which is in its early stages, and to determine the possibility of applications of these new ideas to Quantum Information Science. The specific plans include the following. 1) A coincidence experiment to confirm the angular correlations of entangled photons with angular momentum that have been predicted theoretically will be performed. 2) A second coincidence experiment will be done as a test for a possible application in optical fibers. 3) Light states entangled both in angular momentum and polarization will be created by a combination of path indistinguishability to produce multi-entanglement between entangled polarization states and entangled angular momentum states. The experimental efforts will be accompanied by theoretical studies.