Near-infrared-assisted charge control and spin readout of the nitrogen-vacancy center in diamond

作者：Hopper David A; Grote Richard R; Exarhos Annemarie L; Bassett Lee C

来源：Physical Review B, 2016, 94(24): 241201.

DOI：10.1103/PhysRevB.94.241201

We utilize nonlinear absorption to design all-optical protocols that improve both charge-state initialization and spin readout for the nitrogen-vacancy (NV) center in diamond. Nonmonotonic variations in the equilibrium charge state as a function of visible and near-infrared optical power are attributed to competing multiphoton absorption processes. In certain regimes, multicolor illumination enhances the steady-state population of the NV's negative charge state above 90%. At higher NIR intensities, selective ionization of the singlet manifold facilitates a protocol for spin-to-charge conversion that dramatically enhances the spin readout fidelity. We demonstrate a sixfold increase in the signal-to-noise ratio for single-shot spin measurements and demonstrate a pathway towards single-shot electron spin readout at room temperature.

• 出版日期2016-12-9