Manipulation of single photons from DBT

Harnessing the power of light to process information is a central aim of quantum photonics. In order to do so, single particles of light, so called photons, can be employed. These quantum mechanical objects can be used to encode and transmit information, but their storage is highly challenging: As they are particles of light, they also travel with the speed of light (light can travel around the earth over seven times in one second). Hence, storage of information on photons involves transfer of this information in a memory and also the subsequent read-out. In addition, all this needs to be done without destroying the highly fragile quantum information. In addition to memories, more components are needed in order to process quantum information using photons: First, special light sources that produce the single photons are required. Second, passive circuits are used to process the light accurately. Third, active devices are employed to control and maneuver the light in real-time. Finally, efficient detectors to capture individual particles of light are needed. While significant progress has been made with detectors and processing circuits, the challenge lies in the real-time control and manipulation of individual photons. This is a major hurdle being tackled in the project. The main goal is to create a quantum memory system using atomic vapor which does not only store photons, but also allows for manipulation of their properties. This system can store, retrieve, and process individual particles of light emitted by specific organic molecules. By doing this, individual photons can be efficiently controlled and processed. The main tasks of this project are to build a highly controlled source of photons, which will be done by employing novel microscope techniques in a cryogenic environment. Subsequently, these photons will be stored in the atomic vapor systems and upon read-out their properties will be altered by using interaction with tailored laser pulses. The project involves two groups with expertise in quantum optics and quantum nano photonics, working together to make this technology a reality. The collaboration ensures that all the necessary skills are available to overcome the challenges and make significant progress in the field of quantum information processing.