Humboldt-Universität zu Berlin

Description of the Institution

Humboldt University is one of the 11 Excellence Universities in Germany. Its research and science campus in Berlin-Adlershof is among the 15 largest science and technology parks in the world. This simplifies the establishment of industry contacts with many high-tech companies and direct communications with laboratories supply companies such as Picoquant (single photon detectors, laser systems) and Eagleyard Photonics (laser technology, photonics). In addition to commercial companies, the campus hosts several industry- and application-oriented institutions such as the Federal Institute for Materials Research and Testing, the Helmholtz-Center for Materials and Energy and the German Aerospace Center. Finally, recently, the Humboldt-University has earned the title of “Elite University” within the Berlin University Alliance. This is a prestigious award in the German academic system which increases funding, visibility and speaks for the quality of research of the university itself. With the appointment of the Alexander von Humboldt Professor Arno Rauschenbeutel, UBER has launched the “Joint Lab Photonic Quantum Technologies”. This will bring together photonics, optics, and micro systems with fundamental quantum science on the campus Adlershof. Partner UBER is part of the Humboldt Universities’ physics department which also hosts several other groups in quantum optics, cold-atom physics, and neighboring fields.


Description of Main Tasks and Participant’s Profile

UBER has pioneered the coupling of neutral atoms with photonic nanostructures and has opened a realistic approach to bringing together quantum optics with atoms and photonics. It is fair to say that this work on nanophotonic atom-light interfaces belongs to those landmark experiments that initiat-ed the new field of hybrid quantum systems. UBER features a stimulating working environment with four cold atom experiments, an experiment studying single-photon sources based on molecules and a cavity quantum electrodynamics experiment using a whispering-gallery-mode resonator. In particular, the laboratories available to UBER are completely new and fulfill very high standards for experiments (temperature and humidity control, excellent stability of magnetic fields, etc.). Additionally, at UBER’s facilities, nanofibers can be pulled in a clean room dedicated to this task which even further improves their quality. Therefore, in addition to leading the management, partner UBER will strongly contribute to all experimental work packages and will work together closely with UNOT and AAR on the theory work package. UBER has gained extensive experience in ultra-strong optical nonlinearities using an experimental system in which a single Rubidium atom is strongly coupled to light guided in fibre-based whispering-gallery-mode resonator. Using either an ensembles of atoms coupled to an optical nanofiber or using the atom-resonator system, UBER has also demonstrated non-reciprocal propagation of guided light fields, which will be a valuable asset for the successful completion of UBER’s tasks. Moreover, UBER will, in close collaboration with UROS and FBH, develop a near-deterministic fiber-to-chip coupling for light. This activity will strongly benefit from UBER’s expertise on adiabatic optical mode transformation gained in the production of low-loss tapered optical fibres.

Leading Researchers 

  • Prof. Dr. Arno Rauschenbeutel
    Principal Investigator


    PhotoCredit: ErBeStA / Sebastian Pucher
  • Dr. Philipp Schneeweiss


    PhotoCredit: ErBeStA / Sebastian Pucher
  • Dr. Jürgen Volz
    Staff Scientist


    PhotoCredit: ErBeStA / Sebastian Pucher
    • Dr. Sofia Pazzagli
      Postdoctoral Researcher