Electron Spin as a Spectrometer of Nuclear-Spin Noise and Other Fluctuations

Sousa, Rogério de

doi:10.1007/978-3-540-79365-6_10

Cited by 80 publications

(83 citation statements)

References 51 publications

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“…Also shown is the best-fit Lorentzian for the mean spectral function 〈S n (ω)〉 n (solid black line), and a range of bestfit Lorentzians for the individual spectral functions S n (ω) for each CPmG pulse sequence (light-blue band); a.u., arbitrary unit. (c) scaling of T 2 with the number n of CPmG pulses: derived from nV spin coherence decay data C n (t) (dots); fit of data to a power law T 2 = 250(40) µs×n 0.43 (6) is a result of the combined effect of suppression of electronic spinbath dynamics and dynamical decoupling: the extended spin-bath correlation time enhances the effectiveness of dynamical decoupling, such that T 2 is increased by a factor of ~10 despite the large concentration of N impurities (which would naively suggest almost no dynamic decoupling improvement of T 2 for this sample 30 ). In summary, we applied the spectral decomposition technique to three NV-diamond samples with different composite-spin environments to characterize the spin-bath dynamics and determine the NV multi-spin-qubit FOM.…”

Section: Discussionmentioning

confidence: 99%

Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems

et al. 2012

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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 multispin-qubit systems, thus paving the way for applications in quantum information, sensing and metrology.

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Section: Discussionmentioning

confidence: 99%

Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems

et al. 2012

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“…We take the qubit initial state to be along the x axis (equal superposition of its up and down states), and quantify the qubit coherence by calculating its signal decay function, χ(t), defined as: 30,44 …”

Section: A Single Fluctuatormentioning

confidence: 99%

Non-Gaussian signatures and collective effects in charge noise affecting a dynamically decoupled qubit

Ramon

2015

Phys. Rev. B

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The effects of a collection of classical two-level charge fluctuators on the coherence of a dynamicallydecoupled qubit are studied. Distinct dynamics are found at different qubit working positions. Exact analytical formulae are derived at pure dephasing and approximate solutions are found at the general working position, for weakly-and strongly-coupled fluctuators. Analysis of these solutions, combined with numerical simulations of the multiple random telegraph processes, reveal the scaling of the noise with the number of fluctuators and the number of control pulses, as well as dependence on other parameters of the qubit-fluctuators system. These results can be used to determine potential microscopic models for the charge environment by performing noise spectroscopy.

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“…Furthermore, enhanced NV concentrations could lead to strong NV-NV couplings, which together with long coherence times, achieved using a proper dynamical decoupling protocol [13], could pave the way toward the study of many-body dynamics in the NV-NV interaction-dominated regime [10][11][12]. However, nitrogen defects not associated with vacancies (P1 centers) create randomly fluctuating magnetic fields that cause decoherence of the quantum state of the NV ensemble [14,15]. As a result, in most cases it would be beneficial to increase the concentration of NV centers while keeping the nitrogen concentration constant, i.e.…”

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confidence: 99%

Enhanced concentrations of nitrogen-vacancy centers in diamond through TEM irradiation

Farfurnik

Alfasi

Masis

et al. 2017

Applied Physics Letters

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The studies of many-body dynamics of interacting spin ensembles, as well as quantum sensing in solid state systems, are often limited by the need for high spin concentrations, along with efficient decoupling of the spin ensemble from its environment. In particular, for an ensemble of nitrogenvacancy (NV) centers in diamond, high conversion efficiencies between nitrogen (P1) defects and NV centers are essential, while maintaining long coherence times of an NV ensemble. In this work, we study the effect of electron irradiation on the conversion efficiency and the coherence time of various types of diamond samples with different initial nitrogen concentrations. The samples were irradiated using a 200 keV transmission electron microscope (TEM). Our study reveals that the efficiency of NV creation strongly depends on the initial conversion efficiency as well as on the initial nitrogen concentration. The irradiation of the examined samples exhibits an order of magnitude improvement in the NV concentration (up to ∼ 10 11 NV/cm 2 ), without degradation in their coherence times of ∼ 180 µs. We address the potential of this technique toward the study of many-body physics of NV ensembles and the creation of non-classical spin states for quantum sensing. The study of quantum many-body spin physics in realistic solid-state platforms has been a long-standing goal in quantum and condensed-matter physics. In addition to the fundamental understanding of spin dynamics, such research could pave the way toward the demonstration of non-classical spin states, which will be useful for a variety of applications in quantum information and quantum sensing. One of the leading candidates for such studies is the negatively charged nitrogen-vacancy (NV) center in diamond, having unique spin and optical properties, which make it useful for various sensing applications [1][2][3][4][5][6][7][8][9], as well as a resource for quantum information processing and quantum simulation [10][11][12].The current state-of-the-art is limited by the requirement of obtaining high spin concentrations while maintaining long coherence times. The sensitivity of magnetic sensing grows as the square-root of the number of spins [1,3], thus enhanced NV concentrations could improve magnetometric sensitivities. Furthermore, enhanced NV concentrations could lead to strong NV-NV couplings, which together with long coherence times, achieved using a proper dynamical decoupling protocol [13], could pave the way toward the study of many-body dynamics in the NV-NV interaction-dominated regime [10][11][12]. However, nitrogen defects not associated with vacancies (P1 centers) create randomly fluctuating magnetic fields that cause decoherence of the quantum state of the NV ensemble [14,15]. As a result, in most cases it would be beneficial to increase the concentration of NV centers while keeping the nitrogen concentration constant, i.e. improve the N to NV conversion efficiency.A common technique for improving the conversion efficiency is the irradiation of the sample with elec...

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Electron Spin as a Spectrometer of Nuclear-Spin Noise and Other Fluctuations

Cited by 80 publications

References 51 publications

Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems

Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems

Non-Gaussian signatures and collective effects in charge noise affecting a dynamically decoupled qubit

Enhanced concentrations of nitrogen-vacancy centers in diamond through TEM irradiation

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