Welcome to the quantum optics lab

We explore fundamental quantum physics with atoms, photons and phonons and harness it for applications in quantum technology. In our experiments we study many-particle entanglement in Bose-Einstein condensates, explore hybrid atom-optomechanical systems, and develop quantum memories and sensors with atomic vapour cells. Our research combines experiment with theory, employing techniques of atomic physics, quantum optics and optomechanics. A common goal of our activities is to investigate quantum physics in systems of increasing size and complexity.

News from the lab

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Poster prize for quantum networks based on semiconductor quantum dots and atomic ensembles

Congratulations to Janik Wolters, who won a best poster award at the International Conference on Quantum Communication, Measurement and Computing (QCMC) in Singapore. He reported progress towards the storage of single quantum dot photons in…
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Bell correlations in a Bose-Einstein condensate

The strongest form of correlations between particles are those that violate a Bell inequality. We have detected such Bell correlations between 480 atoms in a Bose-Einstein condensate, using a witness inequality that we derived in…
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Marie Skłodowska-Curie Fellowship

Dr. Janik Wolters was awarded a Marie-Skłodowska-Curie Fellowship from the European Commission for the project "Cold atom-semiconductor quantum interface" - congratulations! We thank the European Union for the generous support and hope that…
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European Research Council (ERC) Starting Grant

The European Research Council has awarded a Starting Grant to Prof. Philipp Treutlein for the project "Modular mechanical-atomic quantum systems", which is scheduled to start in early 2016. We thank the European Union for generously…
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Widefield Microwave Imaging in Alkali Vapor Cells With Sub-100 μm Resolution

We record images of microwave fields with sub-100 μm resolution using a microfabricated alkali vapor cell. The setup can additionally image dc magnetic fields, and can be configured to image microwave electric fields. Our technique could…
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An Artificial Rubidium Atom in a Semiconductor

In collaboration with the Warburton group, we have developed a semiconductor quantum dot single photon source that emits transform-limited photons at 780 nm, the wavelength of the Rubidium D2 line. The quantum dot photons are tuned into…
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Sympathetic Cooling of a Membrane Oscillator in a Hybrid Mechanical-Atomic System

We have used ultracold atoms to cool the vibrations of a nanomechanical membrane from room-temperature to 650 mK. While sympathetic cooling with atoms has previously been used to cool other microscopic particles, we extend it to the cooling…