Departement News

Novel approach to coherent control of a three-level quantum system

For the first time, researchers were able to study quantum interference in a three-level quantum system and thereby control the behavior of individual electron spins. To this end, they used a novel nanostructure, in which a quantum system is integrated into a nanoscale mechanical oscillator in form of a diamond cantilever. Nature Physics has published the study that was conducted at the University of Basel and the Swiss Nanoscience Institute.

 

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The smallest possible system that can be synchronized is discovered

Synchronization is ubiquitous in our everyday life. We experience it for instance when getting jetlagged after a long trip; there, the underlying mechanism is the synchronization of our circadian rhythm to the day-night cycle. Physicists in Basel have addressed a major difficulty that arises when trying to understand this phenomenon in a quantum setting. They have identified the minimal quantum resource that can be synchronized to an external periodic signal. Their system can be readily implemented in the laboratory and provides the ideal platform for studying complex large networks of quantum units. The results have been published in Physical Review Letters and featured as a viewpoint in Physics. We discuss the relation between quantum synchronization and entanglement in another Physical Review Letters.

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Hello Quantum! James Wootton develops a mobile game with IBM

Quantencomputer besitzen eine Aura des Mystischen, nicht Verstehbaren. Das Spiel «Hello Quantum» soll das ändern. Der Quantenphysiker James Wootton von der Universität Basel hat diese App gemeinsam mit IBM entwickelt.

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Startup Qnami wins Venture Kick finals

The young startup of the University of Basel, Qnami, is the winner of the Venture Kick prize worth 130’000 Swiss Francs. Qnami develops precise and highly sensitive quantum sensors that provide images in nanometer resolution.

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PhD Award for Daniel Riedel

Dr. Daniel Riedel, Postdoc in the team of Professor Richard Warburton and PhD student in the SNI’s PhD School until December 2017, received the Swiss Nanotechnology PhD Prize 2018 sponsored by the Hightech Zentrum Aargau. He received the award for his publication in Physical Review X about the improvement of the quality of photons generated by a quantum system.

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The winner of the golden chalk, the golden correction pen & the golden scale FS2018 are known!

Congratulations to the winner of the golden chalk, the golden correction pen & the golden scale!

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Recording the birth and death of a single phonon

When light interacts with a crystal or a molecule, it can transfer energy to and from microscopic vibrations of their constituent atoms. The total energy is conserved, so that the difference in energy between the incoming and outgoing light equals the vibrational energy deposited in or recovered from the material. Physicists in Basel and Lausanne have developed a new technique to measure in real time the creation and destruction of individual quanta of vibrational energy (phonons) using ultra-short laser pulses and single photon detectors. They recorded the birth and death of single phonons in diamond and their technique can be applied to many different Raman active vibrational modes opening the way for detecting exotic vibrational quantum states such as entangled states where energy is delocalised over several vibrational modes. These results have been published in Physical Review Letters and selected as an Editor’s suggestion.

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A Review on macroscopic quantum states appears in Rev. Mod. Phys. and makes the cover...

Quantum theory is by far our best description of the microscopic world. Surprisingly, there is nothing in the theory preventing macroscopic systems to be in quantum states. In principle, a cat could be dead and alive at the same time. A team of researchers around Nicolas Sangouard, in collaboration with colleagues from Innsbruck and Geneva, have written a review article presenting recent results on the difficulties and prospects of creating, maintaining, and detecting macroscopic quantum states. This review, which outlines the role of macroscopic quantum states in foundational questions as well as practical applications, has been published in the prestigious journal Reviews of Modern Physics and has been chosen for the cover of the next issue.

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