Unlocking the Potential of Transmon Qubits: New Research on Quasiparticle Effects

A recent study from the Ando Lab at the University of Cologne and the Catelani group in Jülich sheds light on the magnetic field dependence of quasiparticle tunneling in aluminum transmon qubits, paving the way for advancements in topological quantum computing.

The latest publication titled “Quasiparticle Effects in Magnetic-Field-Resilient Three-Dimensional Transmons“ presents significant findings from research conducted by ML4Q Young Investigator Awardee Chris Dickel and his colleagues in the Ando Lab. This study delves into how quasiparticle tunneling behaves under varying magnetic field conditions in aluminum transmon qubits, which are critical components in the search  for robust quantum computing solutions.

Chris Dickel, who serves as the last author of the paper, emphasizes the research’s relevance: “This work is crucial for utilizing transmons with aluminum Josephson junctions for parity readout in topological quantum computing schemes. It highlights both the limitations and potential of employing thin-film aluminum Josephson junctions in applications where magnetic fields play a vital role, such as hybrid architectures with spin qubits.”

Moreover, the study underscores the significance of the superconducting gap difference between the two sides of the Josephson junction, which plays a pivotal role in quasiparticle tunneling. As quasiparticles begin to impose limitations on transmon quantum processors, understanding and engineering this gap has become increasingly important.

Publication:

More publication highlights