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arxiv: 2507.13295 · v2 · submitted 2025-07-17 · 🪐 quant-ph · cond-mat.other

Local nanoscale probing of electron spins using NV centers in diamond

Sergei Trofimov , Christos Thessalonikios , Victor Deinhart , Alexander Spyrantis , Lucas Tsunaki , Kseniia Volkova , Katja H\"oflich , Boris Naydenov This is my paper

Pith reviewed 2026-05-19 04:23 UTC · model grok-4.3

classification 🪐 quant-ph cond-mat.other
keywords NV centersdiamondnitrogen concentrationDEERhelium ion implantationparamagnetic defectsnanoscale probingquantum sensors
0
0 comments X p. Extension

The pith

Nanoscale NV ensembles made by helium ion beams measure local nitrogen at 230 ppb and other defects at 15 ppb in diamond using DEER.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper shows how to create small clusters of NV centers at chosen locations inside a diamond crystal by firing helium ions through a microscope. These clusters then act as local sensors that detect nearby electron spins from nitrogen atoms and other defects. A resonance method called DEER picks up the signals from these spins, and matching the data to simulations separates the nitrogen contribution from extra defects created by the ions themselves. This matters because nitrogen shortens the coherence time of NV sensors used in quantum devices, and bulk measurements miss the local variations that actually affect device performance at each spot.

Core claim

Helium ion implantation creates nanoscale NV center ensembles at predefined sites in low-nitrogen diamond. Double electron-electron resonance spectra recorded from these ensembles, when compared with numerical simulations, yield a local substitutional nitrogen concentration of 230 ppb together with a concentration of other implantation-induced paramagnetic defects reaching 15 ppb that depends on the ion dose.

What carries the argument

Helium-ion-fabricated nanoscale NV ensembles combined with DEER spectroscopy and numerical simulations that decompose the resonance signals into contributions from substitutional nitrogen versus other paramagnetic defects.

If this is right

  • Device designers can now map defect densities at the exact locations where NV sensors will be used instead of relying on average values.
  • Implantation dose can be tuned to keep unwanted paramagnetic centers below a chosen threshold while still creating enough NV centers.
  • Local measurements become possible for other spin defects that limit coherence in diamond quantum devices.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same local-probing approach could be tested on diamonds grown by different methods to check whether defect patterns are growth-specific.
  • Combining these NV probes with electrical gating might allow real-time monitoring of how defects respond to applied fields.
  • The method offers a route to calibrate implantation damage models directly against measured paramagnetic densities.

Load-bearing premise

The DEER spectra from the NV ensembles can be cleanly separated into nitrogen and other-defect parts by matching them to simulations without large overlaps or hidden calibration errors.

What would settle it

An independent bulk EPR measurement performed on a larger region of the same diamond sample that returns a nitrogen concentration differing by more than 50 ppb from the 230 ppb value obtained locally.

Figures

Figures reproduced from arXiv: 2507.13295 by Alexander Spyrantis, Boris Naydenov, Christos Thessalonikios, Katja H\"oflich, Kseniia Volkova, Lucas Tsunaki, Sergei Trofimov, Victor Deinhart.

Figure 1
Figure 1. Figure 1: FIG. 1: (a) Sample luminescence in UV with an indication of the growth sectors. (b) One out of 9 patterning sites of the [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: (a) Schematics of the experimental setup. MW pulses [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: Experimentally measured (blue points) and numerically simulated using QuaCCAToo software [ [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: (a) Nitrogen concentration obtained from DEER measurements in [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5: Illustration of the detection scheme showing the [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6: Experimentally measured (blue points) and numerically simulated using QuaCCAToo software [ [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7: (a) Ground state spin levels of the NV center aligned with [PITH_FULL_IMAGE:figures/full_fig_p009_7.png] view at source ↗
read the original abstract

Substitutional nitrogen atoms in a diamond crystal (P1 centers) are, on one hand, a resource for creation of nitrogen-vacancy (NV) centers, that have been widely employed as nanoscale quantum sensors. On the other hand, P1's electron spin is a source of paramagnetic noise that degrades the NV's performance by shortening its coherence time. Accurate quantification of nitrogen concentration is therefore essential for optimizing diamond-based quantum devices. However, bulk characterization methods based on optical absorption or electron paramagnetic resonance often overlook local variations in nitrogen content. In this work, we use a helium ion microscope to fabricate nanoscale NV center ensembles at predefined sites in a diamond crystal containing low concentrations of nitrogen. We then utilize these NV-based probes to measure the local nitrogen concentration on the level of 230 ppb (atomic parts per billion) using the double electron-electron resonance (DEER) technique. Moreover, by comparing the DEER spectra with numerical simulations, we managed to determine the concentration of other unknown paramagnetic defects created during the ion implantation, reaching 15 ppb depending on the implantation dose.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript describes the use of a helium ion microscope to create nanoscale NV center ensembles at predefined sites in low-nitrogen diamond. These NV ensembles serve as local probes to quantify substitutional nitrogen (P1 centers) at 230 ppb and other implantation-induced paramagnetic defects at 15 ppb via double electron-electron resonance (DEER) measurements, with concentrations obtained by comparing experimental spectra to numerical simulations.

Significance. If the central claims hold, the work provides a useful method for site-specific, nanoscale measurement of defect concentrations in diamond, addressing limitations of bulk techniques like optical absorption or EPR. This could aid optimization of NV-based quantum sensors by directly quantifying local sources of paramagnetic noise such as P1 centers, with potential impact on diamond quantum device fabrication.

major comments (2)
  1. [Results] Abstract and Results section: The headline quantification of other paramagnetic defects at 15 ppb (depending on dose) is obtained by decomposing DEER spectra through comparison to numerical simulations that separate P1 contributions. The manuscript provides no details on the simulation parameters (spin Hamiltonian, defect spatial distributions, relaxation rates), fitting procedure, error bars, or sensitivity analysis to assumptions about spectral overlap or calibration offsets; this is load-bearing for the 15 ppb claim since mismatches would directly shift the extracted concentrations.
  2. [Methods] Methods: No independent cross-checks are described, such as bulk EPR on the same nanoscale regions, dose-dependent controls, or alternative measurement techniques, to validate that the simulation-based separation of P1 (230 ppb) from other defects is unambiguous rather than an artifact of the model.
minor comments (1)
  1. Figure captions and text should explicitly list the key simulation parameters and any assumed values used for the DEER spectral comparison to improve reproducibility.

Simulated Author's Rebuttal

2 responses · 1 unresolved

We thank the referee for their thorough review and valuable feedback on our manuscript. We address the major comments point by point below and have made revisions to improve the clarity and robustness of our claims.

read point-by-point responses

  1. Referee: [Results] Abstract and Results section: The headline quantification of other paramagnetic defects at 15 ppb (depending on dose) is obtained by decomposing DEER spectra through comparison to numerical simulations that separate P1 contributions. The manuscript provides no details on the simulation parameters (spin Hamiltonian, defect spatial distributions, relaxation rates), fitting procedure, error bars, or sensitivity analysis to assumptions about spectral overlap or calibration offsets; this is load-bearing for the 15 ppb claim since mismatches would directly shift the extracted concentrations.

    Authors: We agree with the referee that more detailed information on the numerical simulations is required to substantiate the 15 ppb quantification. In the revised version of the manuscript, we have expanded the Methods section to include the specific spin Hamiltonian parameters, assumptions regarding defect spatial distributions and relaxation rates, the detailed fitting procedure, and error bars derived from the fits. Furthermore, we have added a sensitivity analysis examining the impact of spectral overlap and calibration offsets on the extracted concentrations. These additions ensure that the decomposition of the DEER spectra is transparent and the 15 ppb value is well-supported. revision: yes

  2. Referee: [Methods] Methods: No independent cross-checks are described, such as bulk EPR on the same nanoscale regions, dose-dependent controls, or alternative measurement techniques, to validate that the simulation-based separation of P1 (230 ppb) from other defects is unambiguous rather than an artifact of the model.

    Authors: We appreciate the suggestion for additional validation. Bulk EPR measurements on the precise nanoscale regions are inherently challenging due to the limited sensitivity and spatial resolution of conventional EPR techniques, which typically require larger sample volumes. However, we have incorporated dose-dependent control experiments in the revised manuscript, demonstrating that the concentration of the additional paramagnetic defects scales with the helium ion implantation dose as expected. We also provide further discussion on the distinct spectral signatures that allow separation of P1 centers from other defects. While alternative local techniques are limited, we believe these controls strengthen the interpretation. revision: partial

standing simulated objections not resolved
  • Validation via bulk EPR on the exact nanoscale implanted regions, as this is not practically feasible with existing EPR instrumentation due to volume requirements.

Circularity Check

0 steps flagged

No significant circularity detected in measurement chain

full rationale

The paper reports an experimental determination of local defect concentrations (230 ppb P1 centers and 15 ppb other defects) by acquiring DEER spectra from fabricated NV ensembles and comparing them to numerical simulations of spin interactions. This process relies on fitting observed data to an independent physical model rather than any self-definitional loop, fitted input renamed as prediction, or load-bearing self-citation chain. No quoted step reduces the extracted concentrations to the input data by construction; the simulations encode standard spin-Hamiltonian physics and spatial distributions that are falsifiable against the measurements. The work is therefore self-contained against external benchmarks with no circular steps.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central quantification step depends on the domain assumption that DEER spectra can be simulated with sufficient fidelity to separate nitrogen from other defects.

axioms (1)
  • domain assumption DEER spectra can be simulated accurately enough to extract separate concentrations of nitrogen and implantation-induced defects
    Invoked when comparing measured spectra to numerical simulations to reach the reported 230 ppb and 15 ppb values.

pith-pipeline@v0.9.0 · 5750 in / 1206 out tokens · 30740 ms · 2026-05-19T04:23:30.835807+00:00 · methodology

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Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Quantum Gates via Dynamical Decoupling of Central Qubit on IBMQ and 15NV Center in Diamond

    quant-ph 2025-09 unverdicted novelty 5.0

    A dynamical decoupling protocol enables fast high-fidelity gates on a central qubit coupled to targets, demonstrated via IBMQ simulation and adapted for 15NV centers in diamond.

  2. Digital Twin Simulations Toolbox of the Nitrogen-Vacancy Center in Diamond

    quant-ph 2025-07 unverdicted novelty 5.0

    A Python library simulates NV center spin dynamics in diamond with a non-perturbative time-dependent Hamiltonian model that includes realistic pulse constraints and optical initialization/readout to predict fluorescen...

Reference graph

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