Tailoring and Manipulation of single photons from DBT molecules with a fast ladder 87Rb quantum memory (DBT-FLAME)

光子学是实现量子信息处理的最有前途的平台之一。一般来说，实现这些应用需要四个主要组成部分：产生非经典光的光子源、用于高保真处理的无源线性光学电路、用于实时路由和操纵光子态的有源器件、以及高效的单光子探测器。如今，光子探测器和被动处理器发展得很好，一个庞大的社区正在研究单光子源。然而，单光子的实时布线和操纵仍然是具有挑战性的，而且很少被解决。对于光学量子信息处理的进一步进展，这可以说是该项目将解决的当今最大的障碍之一。该项目的主要目标是开发一种基于原子蒸气的量子存储器，用于存储和读出以及处理DBT分子发出的单光子。量子光子学中的这一关键构件使得无法从有机分子中区分出的光子能够被路由和处理。潜在的技术方法是将有机分子中高效的按需光子生成与在热原子蒸气中实现的量子存储相结合。光子源是通过将DBT分子耦合到光学天线上，并利用低温显微镜收集在780 nm处发射的光子来实现的。在温暖的RB蒸气中，存储器遵循D2线上的快速梯形EIT方案。在我们的联合体中，两个小组结合了他们互补的技术和实验专长，这是量子光学与原子系统和量子纳米光子学与有机分子的理想方式，以确保项目的成功。

Photonics is among the most promising platforms for realizing quantum information processing. In general, four major ingredients are required for realizing these applications: photon sources that generate non-classical light, passive linear optical circuits for high fidelity processing, active devices for routing and manipulation of photonic states in real time, and efficient single photon detectors. Photon detectors and passive processors are nowadays well developed, and a huge community is investigating single photon sources. However, the real-time routing and manipulation of single photons is still challenging and rarely addressed. For further progress in optical quantum information processing this is arguably one of today’s biggest roadblocks that will be tackled by this project. The overarching goal of this project is to develop an atomic vapor-based quantum memory for the storage and read-out as well as for processing of single photons emitted by DBT molecules. This key building block in quantum photonics enables the routing and processing of indistinguishable photons from organic molecules. The underlying technological approach is to combine the efficient and on- demand photon generation in organic molecules with quantum memories implemented in warm atomic vapor. The photon source is realized by coupling a DBT molecule to an optical antenna and collection of the photons emitted at 780 nm by using a cryogenic microscope. The memory follows a fast ladder EIT scheme on the D2- line in warm Rb vapor. In our consortium two groups join their complementary technological and experimental expertise, which is quantum optics with atomic systems and quantum nano photonics with organic molecules in an ideal way to ensure the success of the project.