Welcome to the quantum optics lab

We explore fundamental quantum physics with atoms, photons and phonons and harness it for applications in quantum metrology and quantum information. In our experiments we study many-particle entanglement in Bose-Einstein condensates and develop quantum interfaces between atoms and solid-state nanosystems such as mechanical oscillators and semiconductor quantum dots. Our research combines experiment with theory, employing techniques of laser cooling, atom chips, optomechanics, and nanofabrication. A common goal of our activities is to investigate quantum physics in systems of increasing size and complexity.

News from the lab

Image

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...
Image

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...
Image

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...
Image

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...
Image

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...
Image

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...
Image

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...