Jerry M. Chow, Jay M. Gambetta, et al.
New Journal of Physics
We report a system where fixed interactions between noncomputational levels make bright the otherwise forbidden two-photon |00⟩→ |11⟩ transition. The system is formed by hand selection and assembly of two discrete component transmon-style superconducting qubits inside a rectangular microwave cavity. The application of a monochromatic drive tuned to this transition induces two-photon Rabi-like oscillations between the ground and doubly excited states via the Bell basis. The system therefore allows all-microwave two-qubit universal control with the same techniques and hardware required for single qubit control. We report Ramsey-like and spin echo sequences with the generated Bell states, and measure a two-qubit gate fidelity of F g=90% (unconstrained) and 86% (maximum likelihood estimator). © 2012 American Physical Society.
Jerry M. Chow, Jay M. Gambetta, et al.
New Journal of Physics
Ewout van den Berg, Sergey Bravyi, et al.
PRResearch
Paul D. Nation, Hwajung Kang, et al.
PRX Quantum
Sergey Bravyi, Oliver Dial, et al.
Journal of Applied Physics