Sensitivity enhancement in superconducting-qubit magnetometry via two-level systems (opens in new tab)

Author(s): Azat Gubaydullin, Vladimir Slepnev, Valerii Vinokur, and Florian NeukartWe study quantum magnetometry based on phase-estimation algorithms in a sensor formed by a superconducting qubit coupled to a two-level system (TLS). Using Ramsey interferometry with single-shot binary readout, we construct a precomputed calibration pattern ${P}_{0}({f}_{q},τ,{ϕ}_{m})$ and implement…[Phys. Rev. B 113, 224522] Published Mon Jun 22, 2026