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Multinode Quantum Network - 2021

We have built and demonstrated the first entanglement-based network connecting multiple quantum processors. Our quantum network is composed of three independent nodes, called Alice, Bob and Charlie, based on diamond nitrogen-vacancy centres. We achieved proof-of-principle demonstration of two key quantum network protocols: genuine multipartite entanglement distribution across all the nodes and any-to-any connectivity via entanglement swapping. The results were published on April 15 in Science.

Artist impression of the three-node quantum network. Illustration by Matteo Pompili. QuTech/Delft University of Technology

Artist’s impression of the three-node quantum network. Credit: Matteo Pompili for QuTech.

Below you can find relevant articles, an image gallery and an animation. Please click on the images to access the high-resolution version. The material may be used free of royalties for purposes of news items when adding content authorship.

Press Release and News items

Scientific article

Realization of a multinode quantum network of remote solid-state qubits
M. Pompili* S. L. N. Hermans*, S. Baier*, H. K. C. Beukers, P. C. Humphreys, R. N. Schouten,
R. F. L. Vermeulen, M. J. Tiggelman, L. dos Santos Martins, B. Dirkse, S. Wehner, R. Hanson
Science, Vol. 372, Issue 6539, published online April 15, 2021.
DOI: 10.1126/science.abg1919
link to online article


Alice, one of the three nodes of our quantum network. Inside the black aluminium cylinder, the diamond sample is cooled to -270 °C, to reduce the noise from the environment and enable the quantum control. Credit: Marieke de Lorijn for QuTech.


Researchers work on one of the quantum network nodes, where mirrors and filters guide the laser beams to the diamond chip. Credit: Marieke de Lorijn for QuTech.


Matteo Pompili (left) and Sophie Hermans (right), two of the coauthors of the research and PhD students in the group of Ronald Hanson, at one of the quantum network nodes. Credit: Marieke de Lorijn for QuTech.


Using a forest of optical components, laser beams of various colours and intensities are combined before being delivered to the diamond chip. Credit: Marieke de Lorijn for QuTech.


High-speed classical communication and control electronics is needed to establish quantum entanglement across the quantum network. Credit: Marieke de Lorijn for QuTech.


The diamond chip of the middle node of the quantum network – Bob – is installed in a cryogenic confocal microscope. At the centre, it is possible to see the printed circuit board that is used to deliver electrical signals to the qubits. On the left, permanent magnets are carefully positioned to align the magnetic field. Credit: QuTech.


Artist’s impression of our three-node quantum network. The quantum bits are housed in a small piece of diamond which is mounted on a PCB (printed circuit board) to deliver electrical signals. Laser beams enable the control and readout of quantum information. The blue lines represent entanglement across the nodes. Credit: Scixel for QuTech.

Video - A Multinode Quantum Network explained

Credit: Slimpot for QuTech.