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

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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.