Coherent control of solid state nuclear spin nano-ensembles

Unden, Thomas; Tomek, Nikolas; Weggler, Timo; Frank, Florian; London, Paz; Zopes, Jonathan; Degen, Christian L.; Raatz, Nicole; Meijer, Jan; Watanabe, Hideyuki; Itoh, Kohei M.; Plenio, Martin B.; Naydenov, Boris; Jelezko, Fedor

doi:10.1038/s41534-018-0089-8

Cited by 28 publications

(55 citation statements)

References 23 publications

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“…In practice, a diamond thin slab with tunable 13 C concentration could be obtained through delta-doping a thin layer of 13 C nuclear spins embedded in a 3D nuclear-spin-free diamond matrix. 41 In order to approach the 2D limit, we also considered graphite as a model host material with a NV-like spin state localized at a C-vacancy site. Although a NV-like spin qubit in graphite is hypothetical, we note that spin qubits have recently been realized as edge states of graphene nanoribbons.…”

Section: Effect Of Reduced Dimensionalitymentioning

confidence: 99%

Spin coherence in two-dimensional materials

Seo

Galli

2019

npj Comput Mater

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Spin defects in semiconducting solids are promising platforms for the realization of quantum bits. At low temperature and in the presence of a large magnetic field, the central spin decoherence is mainly due to the fluctuating magnetic field induced by nuclear spin flip-flop transitions. Using spin Hamiltonians and a cluster expansion method, we investigate the electron spin coherence of defects in two-dimensional (2D) materials, including delta-doped diamond layers, thin Si films, MoS 2 , and h-BN. We show that isotopic purification is much more effective in 2D than in three-dimensional materials, leading to an exceptionally long spin coherence time of more than 30 ms in an isotopically pure monolayer of MoS 2 .npj Computational Materials (2019) 5:44 ; https://doi.

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Section: Effect Of Reduced Dimensionalitymentioning

confidence: 99%

Spin coherence in two-dimensional materials

Seo

Galli

2019

npj Comput Mater

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“…This was achieved by reversing the polarization after each step, so that net nuclear polarization remains zero. In order to distinguish the individual nuclear spin from the bath revealed by the spin-locking technique, we performed a nuclear magnetic resonance (NMR) measurement with readout via dynamical nuclear polarization [24,25]. After polarization of the nuclei, a radiofrequency (RF) pulse is applied followed by the polarization sequence that measures changes in nuclear polarization produced by the RF pulse.…”

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confidence: 99%

Initialization and Readout of Nuclear Spins via a Negatively Charged Silicon-Vacancy Center in Diamond

et al. 2019

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In this work, we demonstrate initialization and readout of nuclear spins via a negatively charged silicon-vacancy (SiV) electron spin qubit. Under Hartmann-Hahn conditions the electron spin polarization is coherently transferred to the nuclear spin. The readout of the nuclear polarization is observed via the fluorescence of the SiV. We also show that the coherence time of the nuclear spin (6 ms) is limited by the electron spin-lattice relaxation due to the hyperfine coupling to the electron spin. This work paves the way towards realization of building blocks of quantum hardware with an efficient spin-photon interface based on the SiV color center coupled to a long lasting nuclear memory.Recent advances with color centers in diamond based on IV-group elements [1-4] hold promise to provide an efficient interface between photons and spin qubits. These color centers possess a high Debye-Waller factor (larger than 0.5) [5,6], which implies a high flux of coherent photons, and furthermore an exceptional spectral stability owing to the inversion symmetry of the defects [7,8]. Both of these properties are crucial to realize long distant entanglement based on light-matter interface [9][10][11] which forms an essential building block for scalable quantum processors and quantum repeaters. However, these color centers are not free of constraints. A main drawback is the limited coherence time of the electron spin which is induced by a fast phonon mediated relaxation process between the orbital branches of the ground state [12]. Different attempts to overcome this problem were recently demonstrated, including the application of high strain [13] or freezing of the specimen to millikelvin temperatures [14]. Of these two methods, the former leads to symmetry distortion that affects the optical properties, while the latter requires dilution refrigerators, which are expensive and offer only limited cooling capability. Another route to beat this limitation is to use a defect of this family only as a spin-photon interface and readout gate, while storing the information on a long living nuclear memory. However, to realize such a hybrid approach several problems have to be tackled. Among them are the initialization of the nuclear memory and its readout. The simple polarization technique utilizing level anticrossing and optical pumping commonly used for NV center coupled to 13 C or ST1 centers [15,16] is not applicable to the systems of SiV family. In this letter, we report deterministic polarization of a small nuclear spin ensemble via a dynamic nuclear polar- * petr.siyushev@uni-ulm.de ization protocol. By measuring the Larmor precession in different magnetic fields we identify these nuclei as 13 C. From this ensemble, we choose one nuclear spin with coupling strength in the order of few hundred kHz. This 13 C spin is used to demonstrate nuclear magnetic resonance and Rabi oscillations via nuclear spin polarization readout protocol. For the experiment, a 111 -oriented diamond sample containing ingrown SiV center was chosen and placed ...

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“…Further characterizations and details on the sample can be found in a recent study (sample B in ref. 35 ).…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional localization spectroscopy of individual nuclear spins with sub-Angstrom resolution

et al. 2018

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Nuclear magnetic resonance (NMR) spectroscopy is a powerful method for analyzing the chemical composition and molecular structure of materials. At the nanometer scale, NMR has the prospect of mapping the atomic-scale structure of individual molecules, provided a method that can sensitively detect single nuclei and measure inter-atomic distances. Here, we report on precise localization spectroscopy experiments of individual 13C nuclear spins near the central electronic sensor spin of a nitrogen-vacancy (NV) center in a diamond chip. By detecting the nuclear free precession signals in rapidly switchable external magnetic fields, we retrieve the three-dimensional spatial coordinates of the nuclear spins with sub-Angstrom resolution and for distances beyond 10 Å. We further show that the Fermi contact contribution can be constrained by measuring the nuclear g-factor enhancement. The presented method will be useful for mapping atomic positions in single molecules, an ambitious yet important goal of nanoscale nuclear magnetic resonance spectroscopy.

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Coherent control of solid state nuclear spin nano-ensembles

Cited by 28 publications

References 23 publications

Spin coherence in two-dimensional materials

Spin coherence in two-dimensional materials

Initialization and Readout of Nuclear Spins via a Negatively Charged Silicon-Vacancy Center in Diamond

Three-dimensional localization spectroscopy of individual nuclear spins with sub-Angstrom resolution

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