Superconductivity is caused by pairing of electrons (formation of Cooper pairs). Usually the required electron-electron interaction is mediated by phonons –vibrations of positive ions in the crystal lattice. In this case Nature finds a smart way of avoiding direct Coulomb repulsion of equally charged electrons in the pair.
Knut och Alice Wallenbergs Stiftelse har nu kungjort de 24 forskare som har utsetts till 2017 års Wallenberg Academy Fellows. Sju av dessa går till Stockholms universitet och två av dem till Fysikum, nämligen Stefano Bonetti och Maria Hermanns.
The ion trapping group at Stockholm University led by Markus Hennrich has implemented the first quantum gate on a trapped Rydberg ion. The result has been published in Physical Review Letters and has been highlighted as an editors’ suggestion.
There is a range of wavelength in the electromagnetic spectrum that is hard to exploit, although it would certainly bring enormous advantages in many fields of application if we were able to build a suitable source. That is known as the THz Gap (The Terahertz Gap), and researchers at Stockholm University seem to have finally found a way around it.
We have recently received the exciting news that, with support from the Knut and Alice Wallenberg foundation, Stockholm University, Uppsala University, Lund University, KTH and MaxIV Laboratory, we will be able to initiate a design study of an x-ray laser beamline in Sweden.
Vi har nyligen fått den glädjande och spännande nyheten att, med stöd av Knut och Alice Wallenbergs stiftelse, Stockholms universitet, Uppsala universitet, Lunds universitet, KTH samt MaxIV, kunna initiera en designstudie för en röntgenlaser strålrör i Sverige.
Entanglement is one of the most puzzling features of quantum theory and a principal resource for quantum information processing. We have for the first time experimental demonstration of this quantum phenomenon with two photonic three-partite nondistillable entangled states.
The trapped ion quantum technologies group at Fysikum led by Markus Hennrich has published a paper in Physical Review X reporting the first Rydberg excitation of trapped strontium ions. Trapped Rydberg ions are a novel quantum system and a promising candidate for building a scalable quantum computer.