TU Delft researchers lay solid foundation for a quantum internet

Press Release

Below you can find the relevant articles, image gallery and video gallery. Please click on the image or link to get more information.


Scientific articles

Heralded entanglement between solid-state qubits separated by three meters
H. Bernien, B. Hensen, W. Pfaff, G. Koolstra, M. S. Blok, L. Robledo, T. H. Taminiau, M. Markham, D. J. Twitchen, L. Childress, R. Hanson
Nature, doi:10.1038/nature12016, Published online 24 April 2013

Image Gallery

high resolution: setup bright, setup dark
This image shows the experimental setup used to entangle two distant spins in diamond. The diamonds are hosted in two low-temperature microscopes, that can be seen on the far corners of the table.

high resolution
A forest of optical elements to guide single photons from- and laser beams to each diamond.

high resolution: chip with diamond, zoom in of diamond
(left) This image shows one of the two chips used in the entanglement experiment. The diamond can be seen wired up exactly in the centre of the image. (right) Zoom in of the diamond chip: under each dome there is a small register of quantum bits.


This animation shows schematically how two spins that are far away from each other can be brought into an entangled state by performing a measurement on the emitted photons.
First both spins are excited by a short laser pulse. The photons that are emitted carry the information of the spin. When the two photons are overlapped on a beamsplitter this information gets mixed. After the beamsplitter it is not possible to say anymore from which of the two spins the photons came from. A detection of the photons then brings the two spins into an entangled state.

In the short video below, Ronald Hanson explains some of the aspects of the research.

English version, Dutch version


Recently, we made a short movie to explain our experiment for a general audience, to compete in the FOM short movie challenge. We were one of three prize-winners! You can see our submission below: