Related papers: Watching a Superconducting Coplanar Waveguide Heat Up with a Single Color Center

Watching a Superconducting Coplanar Waveguide Heat Up with a Single Color Center

URL: http://arxiv.org/abs/2606.15398v1
Date: Sat, 13 Jun 2026 17:01:05 GMT
Title: Watching a Superconducting Coplanar Waveguide Heat Up with a Single Color Center
Abstract summary: Single color centers in diamond offer a local probe of their cryogenic environment.<n>We establish a single spectrally stable tin-vacancy (SnV) center as an on-chip thermometer for a diamond membrane.
Score: 0.04666493857924358
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Single color centers in diamond offer a local probe of their cryogenic environment, providing a direct way to quantify heating in spin-control hardware. Here, we establish a single spectrally stable tin-vacancy (SnV) center as an on-chip thermometer for a diamond membrane and use it to characterize microwave- and radio-frequency-induced heating in a superconducting coplanar waveguide patterned on the same chip. We first calibrate the temperature dependence of the optical C-transition frequency and linewidth from $20\,\mathrm{K}$ down to the few-kelvin regime. At lower temperatures, where the optical response becomes weakly temperature dependent, we use the spin-lattice relaxation time $T_1$ as a complementary thermometer and tune its sensitivity with the transverse magnetic-field component. Applying this local thermometer to a niobium coplanar waveguide, we observe magnetic-field-dependent superconducting breakdown under GHz drive, accompanied by abrupt heating of the diamond. In contrast, at $20\,\mathrm{MHz}$ and $400\,\mathrm{mT}$, relevant for nuclear-spin control, we detect no measurable heating up to the breakdown threshold of $9.4\,\mathrm{dBm}$, corresponding to $B_\mathrm{ac}\sim1.2\,\mathrm{mT}$. These results define a safe operating window for superconducting microwave and RF control structures in diamond-based quantum nodes.

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