Transmon qubits (C05)

• Subject Area: Theoretical Condensed Matter Physics
• Term: since 2020
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 277101999

Coupled superconducting transmon circuits are one of the leading platforms in quantum information science. Their hallmark, the nonlinearity of Josephson junctions, is Janus-faced, enabling the definition of the qubit subspace in the first place but giving rise to correlated errors and possibly many-body quantum chaos. In this project, we will study entanglement in transmon circuits and transmon-resonator networks through the lens of the transmon as a nonlinear quantum element. We will seek novel ways of mitigating the undesirable effects of nonlinearities but also explore nonlinearities as a resource for quantum networks and quantum simulation.

• DFG Programme: CRC/Transregios
• Subproject of: TRR 183: Entangled States of Matter
• Applicant Institution: Universität zu Köln
• Project Heads: Professor Dr. Alexander Altland; Professorin Dr. Christiane Koch; Professorin Dr. Anja Metelmann