Generating unbiased random numbers is critical for high-security fields like cryptography, yet it has remained impossible using conventional methods. In our latest Nature publication, we mark a major milestone by demonstrating the first experiment capable of producing perfectly random numbers. To achieve this, the Wallraff group—with corresponding author Anatoly Kulikov—collaborated with Professor Renato Renner’s group to pair a highly optimized experimental setup with theoretical advances. By utilizing entangled superconducting qubits and a Bell test, the team successfully transformed imperfect randomness into perfect random numbers. This process, known as randomness amplification, is uniquely possible through quantum technology, overcoming the limitations of classical information processing.

We are proud to announce that Nathan Lacroix from our Quantum Device Lab and the Quantum Center won the Division of Quantum Information (DQI) Thesis Award of the American Physical Society! Nathan concluded his thesis on “Quantum Error Correction with Superconducting Circuits” in 2025 and now works at Google Quantum AI. The award recognizes doctoral thesis research of outstanding quality in quantum information science and technology, and encourages effective presentation of research results. Congratulations Nathan! Picture credits: ETH Zurich/Daniel Winkler

Innovative solutions for quantum error correction are needed to implement quantum computing, which requires the use of hundreds of logical qubits in a fault-tolerant manner. Researchers from our group, in collaboration with the theory team of Professor Markus Müller at RWTH Aachen University and Forschungszentrum Jülich, have now demonstrated a technique that makes it possible to perform a quantum operation between superconducting logical qubits while correcting for potential errors occurring during the operation. The results were just published in Nature Physics. This demonstration of lattice surgery on superconducting qubits marks an important step towards the ambitious goal of building useful quantum computers.