Spin-flip and spin-conserving optical transitions of the nitrogen-vacancy centre in diamond

Observation of the dynamic Jahn-Teller effect in the excited states of nitrogen-vacancy centers in diamond

“…Spin-selective optical transitions enable readout of the electron spin at room temperature which is critical for both high sensitivity magnetometry [6] and quantum information processing. Moreover, at cryogenic temperatures, it is proposed that these spin-dependent optical transitions [7,8] could provide an interface between spins and photons as needed in schemes for scalable quantum computation [9, 10] and quantum communication [11,12]. The success of such schemes depends on the coherence properties of the emitted photons which in turn are determined by the coherence properties of the NV excited states.…”

Photonic Crystal Coupled to N-V Center in Diamond

“…Manson et al (2006) showed that the excited state is a triplet split by spin-spin interactions, but with the further addition of spin-orbit coupling . Recent experimental evidence performed by Tamarat et al (2008), has uncovered this excited state structure (Fig.3). The net effect of spin-spin and spin-orbit interactions is to create a detuning ≈ 1.4 GHz (6µeV) between the transitions 3 A (m=0) → 3 E (m=0) (transitions 1)and 3 A (m=+1) → 3 E (m=+1) (transition 3).…”

Quantum coherence and correlations of optical radiation by atomic ensembles interacting with a two-level atom in a microwave cavity

“…To make our discussion concrete, we generalize the Λ-transition generation protocol using external electric fields [61] to the case of ∆-transition. Typical electric field strengths several ∼ M V /m are experimentally used [59]. Under strong electric field the level structure of the negatively charged N-V center is shown in the Fig.…”