Fig. 1
From: Quantum sensing of weak radio-frequency signals by pulsed Mollow absorption spectroscopy
High-frequency sensing by Mollow resonance spectroscopy. a Examples of signals which could be coupled to spins within T 2, but which are out of reach of current \(T_2^*\)-limited protocols17, 18 (g coupling strength, SC superconductor). b High-frequency signals driving the bare spin transition have to be stronger than the inhomogeneous linewidth \(1{\rm{/}}T_2^*\). c Dressing of the spin by a strong drive creates a set of narrow transitions between new eigenstates described by the photon occupation n and the qubit state \(\left| \pm \right\rangle = \left( {\left| 0 \right\rangle \pm \left| 1 \right\rangle } \right){\rm{/}}\sqrt 2 \) with transition frequencies ω 0, ω 0 ± Ω, which enable T 2-limited sensing
