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Physical Review Applied

Deterministically addressing spins at clock transitions with a frequency- and bandwidth-tunable superconducting resonator

Yutian Wen, V. Ranjan, Tristan Lorriaux, D. Vion, Benjamin Huard, Audrey Bienfait, E. Flurin, Patrice Bertet

Published Oct 5, 2026• 0 citations
Publisher
DOI
10.1103/dcmn-v4by

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The authors demonstrate the selective addressability of two nearly degenerate clock transitions in bismuth-doped 28{}^{28}28Si without tuning the magnetic field or microwave frequency. Rather, they vary the microwave polarization between clockwise and counterclockwise circular polarizations, which can be done rapidly. To generate the circularly polarized microwaves, a superconducting coplanar waveguide microresonator was oriented inside a tunable dielectric resonator such that their microwave magnetic fields can be superimposed to give any arbitrary microwave polarization. This work not only opens up additional states near the Si:Bi clock transition, which can be used for different quantum computing schemes, it also demonstrates a clever method for generating arbitrarily polarized microwaves.