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Applied Magnetic Resonance

Optically detected adiabatic fast passage and cross-relaxation of the N-V center in diamond

Eric van Oort, Max Glasbeek

Published Jun 1, 1991• 10 citations
Publisher
DOI
10.1007/bf03166042

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Cross-relaxation dynamics of optically excitedN-Vcenters in diamond

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Upon the cw optical excitation of N-V centers in diamond, a spin alignment in the ensemble of nonexcited N-V defects in the electron spin-triplet ground state is induced. When the diamond sample is subjected to magnetic fields of suitable directions and strengths, cross relaxation (CR) and level anticrossing are found to affect the ground-state spin alignment as well as the intensity of the emission due to the photoexcited N-V centers. In this paper, a study of the dynamics involved in the cross-relaxation and autocrossing processes is reported, utilizing techniques for the optical detection of spin-coherent transients. A major finding is that when CR conditions prevail, the stimulated spin-echo and spin-locking signals decay at a rate about three times faster than in the situation in which CR does not occur. The results are accounted for by considering the magnetic dipole-dipole interactions within the ensemble of N-V centers in the triplet ground state in a memory function approach.

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Raúl Coto, V. Jacques, Gabriel Hetet +1 more

Coherent manipulation of nuclear spins is a highly desirable tool for both quantum metrology and quantum computation. However, most of the current techniques to control nuclear spins lack fast speed, impairing their robustness against decoherence. Here, based on stimulated Raman adiabatic passage, and its modification including shortcuts to adiabaticity, we present a fast protocol for the coherent manipulation of nuclear spins. Our proposed $\mathrm{\ensuremath{\Lambda}}$ scheme is implemented in the microwave domain and its excited-state relaxation can be optically controlled through an external laser excitation. These features allow for the initialization of a nuclear spin starting from a thermal state. Moreover we show how to implement Raman control for performing Ramsey spectroscopy to measure the dynamical and geometric phases acquired by nuclear spins.

arXiv:1705.04229•Physical review. B./Physical review. B•Aug 14, 2017•15 citations
Upon the cw optical excitation of N-V centers in diamond, a spin alignment in the ensemble of nonexcited N-V defects in the electron spin-triplet ground state is induced. When the diamond sample is subjected to magnetic fields of suitable directions and strengths, cross relaxation (CR) and level anticrossing are found to affect the ground-state spin alignment as well as the intensity of the emission due to the photoexcited N-V centers. In this paper, a study of the dynamics involved in the cross-relaxation and autocrossing processes is reported, utilizing techniques for the optical detection of spin-coherent transients. A major finding is that when CR conditions prevail, the stimulated spin-echo and spin-locking signals decay at a rate about three times faster than in the situation in which CR does not occur. The results are accounted for by considering the magnetic dipole-dipole interactions within the ensemble of N-V centers in the triplet ground state in a memory function approach.
Here, we investigate the magnetic field dependent photoluminescence (PL) of a fiber-coupled diamond single crystal with a high density of nitrogen vacancy (NV) centers. Angle-dependent magnetic field sweep measurements between 0 and 111 mT were performed using an oscillating illumination combined with lock-in techniques. Besides the expected superposed PL of differently oriented NV centers, a zoo of features in the PL are found. These features can be associated with level anti-crossings and cross relaxations. In particular, PL measurements allowed us to detect auto-cross relaxation between coupled NV centers. Moreover, the PL measurements at low magnetic fields show dips suggesting an interaction of NV centers with additional spin defects. The results presented here are not only a study for NV-based fiber-coupled sensors made of diamond, but also show a way to investigate with manageable effort and purely an optical multispin interaction with at least one NV center as a constituent.
Coherent manipulation of nuclear spins is a highly desirable tool for both quantum metrology and quantum computation. However, most of the current techniques to control nuclear spins lack fast speed, impairing their robustness against decoherence. Here, based on stimulated Raman adiabatic passage, and its modification including shortcuts to adiabaticity, we present a fast protocol for the coherent manipulation of nuclear spins. Our proposed $\mathrm{\ensuremath{\Lambda}}$ scheme is implemented in the microwave domain and its excited-state relaxation can be optically controlled through an external laser excitation. These features allow for the initialization of a nuclear spin starting from a thermal state. Moreover we show how to implement Raman control for performing Ramsey spectroscopy to measure the dynamical and geometric phases acquired by nuclear spins.