Fig. 2: Extension of coherence for \({V}_{B}^{-}\) in hBN.
From: Extending the coherence of spin defects in hBN enables advanced qubit control and quantum sensing
a Measured decoherence curves (semi-log plot) for the \({V}_{B}^{-}\) spins under the effect of different CPMG decoupling pulse sequences with an increasing number of π-pulses N. Colored dots and solid lines are data points and fits, respectively. In black, the T1 measurement of Fig. 1g is shown with the corresponding fit as dotted line. Bottom, left: dynamical decoupling (CPMG) pulse sequence. Bottom, right: the data enclosed in the dotted box are shown in Supplementary Fig. 2. Inset: plot of the coherence times vs the number of π-pulses N utilized in each CPMG experiment. The data points fit a power function f(N) = a × N s where s ~ 0.71. b Rotating-frame spin-lattice relaxation time (T1ρ) measured with the depicted spinlock sequence (blue), in comparison with the T1 measurement (black).
