Quantum Optics Lab

Treutlein Group


Earlier news

ICOLS Poster Prize for Coherence, EPR, and Bell Correlations in a BEC

We congratulate Boris Décamps for winning a poster prize at the International Conference on Laser Spectroscopy 2017. His poster was entitled Coherence Times, EPR Entanglement, and Bell Correlations in a Bose-Einstein Condensate. He reported on violation of the EPR steering criteria by spatially separated regions of a spin squeezed BEC, as well as N-particle witnesses of Bell correlations, and quantitative models of decoherence that can be used to correct for phase noise.

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APS Outstanding Referee Award

Congratulations to Philipp Treutlein, whom the American Physical Society recognized in the 2017 iteration of their highly selective Outstanding Referee Program. This year only 150 people of the roughly 60000 currently active referees were honored with this lifetime award. The APS instituted the program in 2008 to thank and recognize those referees, whose efforts not only keep the standards of the journals high, but also help authors improve the quality and readability of their articles.

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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 a rubidium quantum memory. The experiments were carried out in collaboration with the Warburton group.

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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 collaboration with the theory groups of N. Sangouard and V. Scarani. The results were reported in Science 352, 441-444 (2016).

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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 the project will help to exploit the potential of quantum science to benefit the European economies and societies.

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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 supporting the Swiss research community.

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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 prove transformative in the design, characterisation, and debugging of microwave devices and find applications in medical imaging. These results were published in New Journal of Physics 17, 112002 (2015) as a fast track communication.

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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 exact resonance with hyperfine transitions of natural Rubidium atoms, a key step towards storing them in an atomic quantum memory. These results were published in Phys. Rev. B 92, 245439 (2015)..

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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 of an engineered solid-state structure, whose mass is 10 orders of magnitude larger than that of the atoms. These results were published in Nature Nanotechnology 10, 55 (2015). See also the news features in Deutschlandfunk and Telebasel.

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