Helped establish circuit quantum electrodynamics and co-developed the transmon, connecting superconducting qubits to microwave circuits that can control and protect quantum information.
Yale UniversityarXiv / Physical Review ASchoelkopf helped turn superconducting electrical circuits into a platform for manipulating quantum information. Circuit quantum electrodynamics provides a way to couple artificial atoms to microwave photons, while the transmon design reduces a major source of qubit sensitivity. These contributions concern the physical building blocks of a processor, not just a single demonstration. His Yale research also connects those devices to quantum operations and error correction, linking foundational circuit design to the demands of computation.
Yale UniversityarXiv / Physical Review ADefining contributions
Work, in context- 2004
Circuit quantum electrodynamics
Schoelkopf co-authored the demonstration of strong coupling between a superconducting qubit and a single microwave photon. This work helped establish circuit quantum electrodynamics as a framework for controlling quantum states in engineered electrical circuits.
Co-author of the 2004 strong-coupling experiment with the circuit-QED team.
Source-supported recordYale University - 2007
The transmon qubit design
With collaborators, Schoelkopf introduced a qubit design that greatly reduces sensitivity to charge noise by changing the balance of Josephson and charging energies. The transmon retains enough anharmonicity to permit selective quantum control.
Co-author of the transmon proposal with Koch and the other named collaborators.
Source-supported recordarXiv / Physical Review A
Keep in perspective
The circuit and transmon contributions were collaborative; this profile does not assign sole inventorship.
Follow the evidence
2 sourcesPrimary papers, institutional records and attributed announcements. Each source supports the claims linked above.
- Yale UniversityInstitutional profile
Robert J. Schoelkopf
Current professorship, circuit-QED research, 2004 strong-coupling publication and later circuit work.
Checked 2026-09-19 - arXiv / Physical Review APrimary research
Charge insensitive qubit design derived from the Cooper pair box
Co-authorship and the transmon design, charge-noise suppression and retained controllability.
Published 2007-02-28 · Checked 2026-09-19