our mission

We explore the physics at low and ultra-low temperatures with special focus on superconductivity and magnetism as well as on the control of quantum systems in the field of quantum technologies.

WMI Supports the Scientific Program of "FORSCHA"
Discover what moves the world! This was the motto of the Münchener Wissenschaftstage 2021, taking place at the Deutsches Museum Verkehrszentrum from October 08 to 10. WMI supported the scientific program of the event by a public talk on quantum computing.
Science outreach
Watch how our team members approach scientific communication within the EU ITN QuSCo.
Characterization and Tomography of a Hidden Qubit
Have you ever wondered how to control and measure a hidden superconducting qubit?
whats happening
News & Events
WMI-Seminar (11:15): Wilhelm Wittl

Title: “Investigation of proximity induced superconductivity in Al-based topological Josephson junctions”

Affiliation: University of Regensburg & Forschungszentrum Jülich

Time: 11:15

Characterization and Tomography of a Hidden Qubit

In state-of-the-art quantum computing systems, each quantum bit can be individually controlled and measured. Large systems of qubits thus require a large amount of control electronics and signal lines, which are costly resources. One way to increase the number of qubits without also multiplying auxiliary resources is simply to add “hidden” qubits that are not directly controlled or read out. These are operated indirectly, using interactions with their neighboring qubits and do not require a separate control line. In our experiment, we demonstrate full control over a superconducting two-qubit system even though only one of the qubits is directly addressable.

The addition of hidden qubits does come at a cost: increased complexity of their manipulation, which can lead to lower fidelity. By estimating the quantum volume—a quantity describing the computational power of quantum devices—we find that adding hidden qubits to a system with a fixed number of control lines would enable higher quantum volumes once error rates are reduced by only 1 order of magnitude from their current values. With expected future reductions in error rates, hidden qubits could soon become practical and turn into a useful quantum engineering tool.

Science outreach

Within the Marie Curie european network QuSCo, our students Federico Roy and Max Werninghaus collaborated with colleagues from various fields to apply optimal control to quantum systems. Over the course of the three-year program, the ESRs were trained in science education and outreach. Check out the playlist on youtube to learn more about how we approach science education!


WMI-Seminar Talk by Ngoc Linh Tran (Université Paris-Saclay) - 10:15am

Title: Mid-infrared Intersubband Polariton Devices

WMI-Seminar Talk by Mihal Gabureac (ETH Zurich) - 11:15am

Title: Fabrication of Superconducting, Ferromagnetic and hybrid S-I-F devices

1 open PhD position (m/f/d)

on the experimental realization of a superconducting microwave single-photon detector