Photoionization of negatively charged NV centers in diamond: Theory and 
<i>ab initio</i>
 calculations

Razinkovas, Lukas; Maciaszek, M.; Reinhard, Friedemann; Doherty, Marcus W.; Alkauskas, Audrius

doi:10.1103/physrevb.104.235301

Cited by 40 publications

(26 citation statements)

References 51 publications

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“…4D), limiting our single-shot readout fidelity. We attribute this saturation behavior to stimulated emission from the excited state induced by the 1151-nm ionization laser ( 40 ). Stimulated emission induces an excited–to–ground state transition of the defect, effectively increasing the spin-flip rate and decreasing the occupation time in the excited state.…”

Section: Resultsmentioning

confidence: 99%

“…We computed the optical matrix elements pertaining to the ionization and stimulated emission cross sections using a G-centered supercell with 1296 atomic sites and the Perdew-Burke-Ernzerhof functional ( 54 ). Electron-phonon spectral functions were computed using the generating function approach within the displaced harmonic approximation ( 40 , 55 , 56 ). The phonon modes of the defective solid were obtained using a 5 × 5 × 2 supercell generated with the PHONOPY ( 57 ) package and extrapolated to larger sizes (16 × 16 × 5 supercell).…”

Section: Methodsmentioning

confidence: 99%

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Five-second coherence of a single spin with single-shot readout in silicon carbide

et al. 2022

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An outstanding hurdle for defect spin qubits in silicon carbide (SiC) is single-shot readout, a deterministic measurement of the quantum state. Here, we demonstrate single-shot readout of single defects in SiC via spin-to-charge conversion, whereby the defect’s spin state is mapped onto a long-lived charge state. With this technique, we achieve over 80% readout fidelity without pre- or postselection, resulting in a high signal-to-noise ratio that enables us to measure long spin coherence times. Combined with pulsed dynamical decoupling sequences in an isotopically purified host material, we report single-spin T 2 > 5 seconds, over two orders of magnitude greater than previously reported in this system. The mapping of these coherent spin states onto single charges unlocks both single-shot readout for scalable quantum nodes and opportunities for electrical readout via integration with semiconductor devices.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Five-second coherence of a single spin with single-shot readout in silicon carbide

et al. 2022

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“…While single NV centers have superior spatial resolution, there are certain drawbacks including tedious co-localization of the sample and a suitable NV center, 13,16,80 intrinsically inhomogeneous properties 36,41,80 and instability of single, near-surface NV centers. 81,82 Furthermore, the detection of single photons make these experiments susceptible to background fluorescence. Consequently, the overall experimental complexity of single NV center experiments 83 with long averaging times and background fluorescence results in a low throughput for troubleshooting and/or detection of large parameter spaces.…”

Section: Shallow Nv Ensembles Experimentsmentioning

confidence: 99%

Advances in nano- and microscale NMR spectroscopy using diamond quantum sensors

2022

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“…While single NV centers have a superior spatial resolution, there are certain drawbacks including tedious co-localization of the sample and a suitable NV center 13,16,80 , intrinsically inhomogeneous properties 36,41,80 and instability of single, near-surface NV centers 81,82 . Furthermore, the detection of single photons make these experiments susceptible to background fluorescence.…”

Section: Shallow Nv Ensembles Experimentsmentioning

confidence: 99%

Advances in nano- and microscale NMR spectroscopy using diamond quantum sensors

Allert¹,

Briegel²,

Bucher³

2022

Preprint

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Quantum technologies have seen a rapid developmental surge over the last couple of years. Though often overshadowed by quantum computation, quantum sensors show tremendous potential for widespread applications in chemistry and biology. One system stands out in particular: the nitrogen-vacancy (NV) center in diamond, an atomic-sized sensor allowing the detection of nuclear magnetic resonance (NMR) signals at unprecedented length scales down to a single proton. In this article, we review the fundamentals of NV center-based quantum sensing and its distinct impact on nano- to microscale NMR spectroscopy. Furthermore, we highlight and discuss possible future applications of this novel technology ranging from energy research, material science, or single-cell biology, but also associated challenges of these rapidly developing NMR sensors.

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Photoionization of negatively charged NV centers in diamond: Theory and ab initio calculations

Cited by 40 publications

References 51 publications

Five-second coherence of a single spin with single-shot readout in silicon carbide

Five-second coherence of a single spin with single-shot readout in silicon carbide

Advances in nano- and microscale NMR spectroscopy using diamond quantum sensors

Advances in nano- and microscale NMR spectroscopy using diamond quantum sensors

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