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Quantum technologies

Dieter Meschede's research group

Quantum technologies with single neutral atoms


Atoms can be in two places at the same time

Can a penalty kick simultaneously score a goal and miss? For very small objects, at least, this is possible: according to the predictions of quantum mechanics, microscopic objects can take different paths at the same time. The world of macroscopic objects follows other rules: the football always moves in a definite direction. But is this always correct? Physicists of the University of Bonn have constructed an experiment designed to possibly falsify this thesis (view the scientific publication). Their first experiment shows that Caesium atoms can indeed take two paths at the same time. Read more...

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Talented students wanted

Scientists at workScientists at work

We are constantly seeking young talented scientists, who are willing to play a key role in one of our quantum experiments. If you believe that you are one of these students, please get in contact with us. We will be very happy to show you around in our laboratories and to discuss with you some exciting physics project.

Why with us? Because here your ideas and your skills make a significant difference and because "taming" single atoms at the most fundamental quantum level is indeed an exciting job! That is what we experience everyday. You also will get thorough supervision by experienced senior scientists, but more importantly you will be given much freedom to express yourself.


Visiting scientist from Laboratoire Kastler-Brossel

We are very glad to host Jean-Michel Raimond in our group for about 10 weeks. Jean-Michel Raimond is Professor of the Universit√© Pierre et Marie Curie and former director of the Physics departement at the Ecole Normale Sup√©rieure. He devoted is research to the exploration of interaction of light and matter at the most fundamental quantum level at the Laboratoire Kastler-Brossel, where he is a very close collaborator of the recent nobel laureate Serge Haroche. His stay in Bonn is supported by the Alexander von Humboldt foundation, from which he has been recently awarded the Humboldt Prize. We are enjoying a fruitful scientific collaboration! 


Cavity QED with single atoms


The goal of cavity quantum electrodynamics (cavity-QED) is to investigate and understand light-matter interaction at the most fundamental level by preparing a basic model system: a single atom strongly coupled to a single photon in a well-controlled environment. While individual atoms can be controlled well by laser-cooling and trapping techniques, photons have to be confined by reflecting them back and forth in cavities, which thus act as a "trap" for light.

In such a system the physics behind spontaneous and stimulated emission of light and the associated transitions of the atom between different quantum states can be investigated and illustrated in a unique way. This becomes possible due to the strong coupling between the atom and the cavity field, enabling a single atom to control the transmission of light through the cavity, and allowing a single photon to deterministically change the state of the atom. Quantum communication could be a future application of these controlled interaction between individual photons and atoms. 


Few-atom quantum systems

Fig. 1: The vacuum cell with lattice and imaging system: Individual cesium atoms can be trapped and observed.

Our team is working on quantum information processing using a small number of Cesium atoms. We load the atoms into a 1D optical lattice and use the spin of each atom as a quantum bit, with the ability to set and read out each atom individually - a quantum register. Our lattice uses a special wavelength which makes the optical potential state-depedent, giving us the ability to shift atoms in the lattice depending on their internal state. We are currently researching the phenomena exhibited by a single atom when it is coherently separated over several sites. Ultimately, our goal is the controlled interaction of two atoms, creating entanglement that can be used in a quantum computation.

Our recent results include:



Stats from quantum walk lab

Runtime in the past:
  • Week: 10.8%
  • Month: 5.0%
  • Six months: 24.3%
Temperature: 21.0℃
Best 3 work days:
  • Thu: 17.8%
  • Wed: 16.4%
  • Sat: 15.8%