Fig. 2: Experimental demonstration of coherence stabilization.
From: Beating the Ramsey limit on sensing with deterministic qubit control
a, b Bloch vector evolution, as measured through quantum state tomography, for a state with a vx(0) = 0.652 and breakdown at 148 μs and b vx(0) = 0.599 with no breakdown (i.e, a stable state). c, d Evolution of vy for the same initial states as in (a, b), with added small detuning Δ/2π = 396 Hz (c) and 324 Hz (d). Crucially, the stabilized states exhibit significantly larger signal than the Ramsey value.
