Welcome to SuperQuLAN

Superconducting quantum circuits are one of the most promising platforms for realizing large-scale quantum computing devices, where in the near future a coherent integration of 100-1000 quantum bits (qubits) is feasible. However, the required temperatures of only a few mK currently restrict quantum operations to qubits that are located within a single, heavily shielded dilution refrigerator. This imposes a serious constraint on the realization of even larger quantum processors or the implementation of local- and wide-area quantum networks based on this technology.

The project SuperQuLAN is set out to address this important open problem and to demonstrate a first operational prototype quantum local area network (QuLAN) of separated superconducting quantum processors. This work will be carried out by a multi-national team of scientists and industry partners who will develop key network components and quantum communication protocols that will facilitate in the long term the realization of large quantum computing clusters or even city-wide quantum networks using superconducting circuits.

The project is funded by the Horizon 2020 research and innovation programme of the European Union.


01.05.2022: Workshop & Summer School

After two years of travel restrictions we are happy to announce that both our workshop on superconducting quantum networks as well as our summer school can take place in person in Sep. 2022. Please check 'Events' for further updates.

06.04.2022: Long-distance qubit-qubit entanglement using Gaussian photonic beams

TU Wien and IST have analyzed the distribution of entanglement over long distances by driving separated quantum nodes with the output of a two-mode squeezed parametric amplifier. This scheme is very robust with respect to various imperfections and is ideally suited for microwave-to-optics entanglement generation using the electro-optical device implemented at IST. Read more details about this scheme in the preprint: arXiv:2204.02993.

07.10.2021: Deterministic quantum operations in microwave quantum links

The theory teams in Madrid and Vienna have proposed and analyzed a set of deterministic quantum operations for implementing gates between remote qubits in a cryogenic quantum link, similar to the device implemented at ETH Zürich. Take a look at the preprint at: arXiv:2110.02092.

15.09.2021: Photonic tensor network states in circuit QED

Our partners at MPQ have described an efficient protocol to generate photonic tensor network states using superconducting quantum circuits. Read more details about this scheme in the preprint: arXiv:2109.06781.

17.07.2021: Quantum interface between microwave and telecom light

The group of Johannes Fink at IST Austria has demonstrated a pulse electro-optical transducer between microwave and telecom photons (arXiv:2107.08303). The impressively low amount of added noise (less than a single photon) is a big step forward toward our goal of realizing quantum-coherent interfaces between superconducting quantum processors and flying photonic qubits.

06.07.2021: Zurich Instruments joins Rohde & Schwarz

Zurich Instruments is joining the Rohde & Schwarz family to continue on its path of innovation and support customers even better. Congratulations to this big step forward! Watch this video on twitter to hear all about the news from the CEO Sadik Hafizovic.

07.06.2021: Quantum gates for 'flying' qubits

ETH Zürich has demonstrated for the first time a universal set of gates for itinerant microwave photons, that means, for mobile qubits that can be sent between different superconducting chips. This is a crucial ingredient for many quantum networking applications. For more details see the pre-print at:

12.05.2021: "Munich Quantum Stammtisch"

Another Munich Quantum Stammtisch took place on the topic "Quantum Key Distribution - useful or just fun?". To hear the opinion of some of the leading experts on this subject, watch the video on YouTube.

05.03.2021: Machine learning for certifying quantum many-body states

Together with collaborators at ICFO, Jordi Tura (MPQ, now AQA) has proposed a machine learning approach for certifying quantum many-body states with a minimal computational budget (arXiv:2103.03830). Such schemes will also be the basis for some of the QuLAN algorithms explored in this project.

18.01.2021: Shor's algorithm in one nanosecond

In collaboration with Peking University, our team at TU WIEN has investigated the fundamental limits for the speed of superconducting quantum processors and has shown that compared to the current state of the art, a more than hundredfold improvement in the gate times is still possible. Here is the pre-print on the arXiv:

21.12.2020: A first quantum local area network

The group of Andreas Wallraff at ETH Zürich has demonstrated for the first time the operation of a coherent quantum link between superconducting qubits that are housed in two spatially separated cryogenic systems. This is a key breakthrough for the SuperQuLAN project . Check out the original publication in Physical Review Letters and the synopsis in Physics.

23.11.2020: Bidirectional electro-optical conversion

Our partners at IST Austria have demonstrated a bidirectional electro-optical converter between microwave and optical photons operated at the quantum level. These results have now been published in Physical Review X.

01.11.2020: Jordi Tura - Assistant Professor in Leiden

Jordi Tura has been appointed Assistant Professor at the University of Leiden, where he joins the Applied Quantum Algorithms (aQa) group as a new faculty member. Congratulations! Jordi will remain an associated partner of SuperQuLAN.

03.09.2020: Kick-off Meeting

On Thursday, Sep. 3rd, all the PIs, postdocs and PhD students involved in the project meet for the first time to 'kick-off' the project, exchange ideas and to discuss the most urgent research tasks to address. Due to the Corona situation the meeting will be held online, but we stay optimistic and hope that we will also be able to meet in person in the near future.

01.09.2020: Official start of SuperQuLAN

With Sep. 1st, 2020 the SuperQuLAN project has officially started. We are excited about the next 3 years to come.