23 research outputs found
Towards T1-limited magnetic resonance imaging using Rabi beats
Two proof-of-principle experiments towards T1-limited magnetic resonance
imaging with NV centers in diamond are demonstrated. First, a large number of
Rabi oscillations is measured and it is demonstrated that the hyperfine
interaction due to the NV's 14N can be extracted from the beating oscillations.
Second, the Rabi beats under V-type microwave excitation of the three hyperfine
manifolds is studied experimentally and described theoretically.Comment: 6 pages, 8 figure
Temperature-Dependent Spin-Lattice Relaxation of the Nitrogen-Vacancy Spin Triplet in Diamond
Spin-lattice relaxation within the nitrogen-vacancy (NV) center’s electronic ground-state spin triplet
limits its coherence times, and thereby impacts its performance in quantum applications. We report
measurements of the relaxation rates on the NV center’s jm s ¼ 0i ↔ jms ¼ 1i and jm s ¼ −1i ↔
jms ¼ þ1i transitions as a function of temperature from 9 to 474 K in high-purity samples. We show that
the temperature dependencies of the rates are reproduced by an ab initio theory of Raman scattering due to
second-order spin-phonon interactions, and we discuss the applicability of the theory to other spin systems.
Using a novel analytical model based on these results, we suggest that the high-temperature behavior of NV
spin-lattice relaxation is dominated by interactions with two groups of quasilocalized phonons centered at
68.2(17) and 167(12) meV
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Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems
Multi-qubit systems are crucial for the advancement and application of quantum science. Such systems require maintaining long coherence times while increasing the number of qubits available for coherent manipulation. For solid-state spin systems, qubit coherence is closely related to fundamental questions of many-body spin dynamics. Here we apply a coherent spectroscopic technique to characterize the dynamics of the composite solid-state spin environment of nitrogen-vacancy colour centres in room temperature diamond. We identify a possible new mechanism in diamond for suppression of electronic spin-bath dynamics in the presence of a nuclear spin bath of sufficient concentration. This suppression enhances the efficacy of dynamical decoupling techniques, resulting in increased coherence times for multi-spin-qubit systems, thus paving the way for applications in quantum information, sensing and metrology.Physic