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arxiv: 2605.27841 · v2 · pith:YELEFXMRnew · submitted 2026-05-27 · 🪐 quant-ph

Coherent Dark State Formation of a Lead-Vacancy Spin Qubit in Diamond

Yiyang Chen , Koyo Hirai , Tzyy Zheng Neo , Eiki Ota , Takashi Taniguchi , Masashi Miyakawa , Shinobu Onoda , Toshiharu Makino
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Mutsuko Hatano Takayuki Iwasaki
This is my paper

Pith reviewed 2026-06-29 12:28 UTC · model grok-4.3

classification 🪐 quant-ph
keywords lead-vacancy centerdiamondspin qubitcoherent population trappingdark statethermal robustnessquantum networks
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The pith

Lead-vacancy centers in diamond form a coherent dark state with 12 ms spin lifetime at 7.5 K

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

The paper measures the spin and magneto-optical properties of lead-vacancy centers in diamond. It finds a spin lifetime of 12 ms at 7.5 K under a large off-axis magnetic field. Coherent population trapping produces a dark state, yielding an estimated dephasing time of 177 ns at 6.5 K. These numbers establish that the PbV spin remains stable at temperatures above 4 K where other group-IV centers lose coherence, which matters for building quantum networks that need less extreme cooling.

Core claim

A lead-vacancy center in diamond exhibits coherent emission above liquid helium temperature. Under a large off-axis magnetic field the spin lifetime reaches 12 ms at 7.5 K. Coherent population trapping creates a coherent dark state whose dephasing time is 177 ns at 6.5 K. The results show that the PbV spin qubit retains useful coherence at temperatures above 4 K, unlike other group-IV centers.

What carries the argument

Coherent population trapping that produces a coherent dark state in the PbV spin system under off-axis magnetic field

If this is right

  • PbV centers can be operated at temperatures above 4 K while preserving spin coherence suitable for quantum networks.
  • The observed dark state provides a means to store quantum information without rapid dephasing at 6.5 K.
  • Reduced cooling requirements follow directly from the demonstrated thermal robustness compared with other group-IV centers.

Where Pith is reading between the lines

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

  • Simpler cryogenic systems could suffice for PbV-based nodes in a quantum network.
  • The same dark-state technique might be tested in other group-IV centers to isolate which structural feature grants the extra temperature range.

Load-bearing premise

The recorded lifetimes and dark-state signals come from lead-vacancy centers rather than other defects or measurement artifacts.

What would settle it

Repeating the magneto-optical and coherent-population-trapping measurements on a diamond sample confirmed to contain no PbV centers and finding the same 12 ms lifetime or 177 ns dephasing time.

Figures

Figures reproduced from arXiv: 2605.27841 by Eiki Ota, Koyo Hirai, Masashi Miyakawa, Mutsuko Hatano, Shinobu Onoda, Takashi Taniguchi, Takayuki Iwasaki, Toshiharu Makino, Tzyy Zheng Neo, Yiyang Chen.

Figure 1
Figure 1. Figure 1: FIG. 1: Magneto-optical properties of the PbV center. [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: Spin initialization and SSR performance of the [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: Longitudinal relaxation time. (a) [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: CPT of the PbV center. (a) Sequence and a [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
read the original abstract

A lead-vacancy (PbV) center in diamond exhibits coherent emission above the liquid helium temperature, making it highly attractive for quantum network applications. Here, we report the magneto-optical and spin properties of PbV centers in diamond. We record a spin lifetime of 12 ms at 7.5 K under large off-axis magnetic field. Furthermore, we observe formation of the coherent dark state by coherent population trapping and estimate a spin dephasing time of 177 ns at 6.5 K. This work demonstrates the outstanding thermal robustness of the PbV spin compared to other group-IV centers above 4 K.

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 reports experimental magneto-optical and spin properties of lead-vacancy (PbV) centers in diamond. It measures a spin lifetime of 12 ms at 7.5 K under large off-axis magnetic field, observes coherent dark state formation via coherent population trapping (CPT), and estimates a spin dephasing time of 177 ns at 6.5 K, concluding that PbV exhibits outstanding thermal robustness relative to other group-IV centers above 4 K.

Significance. If the signals are unambiguously attributed to PbV centers, the results would indicate that PbV spins maintain long T1 and observable CPT at temperatures significantly above 4 K, which could reduce cryogenic demands for diamond-based quantum network nodes. The combination of lifetime, dephasing, and dark-state data would strengthen the case for PbV as a viable alternative to SiV or SnV centers.

major comments (2)
  1. [Center identification section] Center identification section: the manuscript must supply quantitative spectral (ZPL position, linewidth, temperature shift) and magnetic-field dependence data that match only the established PbV parameters while placing explicit upper bounds on possible contributions from NV, SiV, or unknown defects to the lifetime and CPT traces. Without this, attribution of the 12 ms T1 and 177 ns T2* remains the load-bearing uncertainty for the thermal-robustness claim.
  2. [Spin lifetime and CPT results] Spin lifetime and CPT results: the reported values of 12 ms (7.5 K) and 177 ns (6.5 K) appear without error bars, raw decay traces, fitting procedures, or temperature-calibration details, preventing independent verification of the headline numbers that underpin the comparison to other group-IV centers.
minor comments (1)
  1. [Abstract] Abstract: numerical results should include uncertainty estimates to allow readers to gauge precision immediately.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback on our manuscript. We address the two major comments point-by-point below and will revise the manuscript to incorporate additional data and details as outlined.

read point-by-point responses

  1. Referee: [Center identification section] Center identification section: the manuscript must supply quantitative spectral (ZPL position, linewidth, temperature shift) and magnetic-field dependence data that match only the established PbV parameters while placing explicit upper bounds on possible contributions from NV, SiV, or unknown defects to the lifetime and CPT traces. Without this, attribution of the 12 ms T1 and 177 ns T2* remains the load-bearing uncertainty for the thermal-robustness claim.

    Authors: We agree that unambiguous attribution is critical. The manuscript and its supplementary information already contain ZPL spectra, linewidth measurements, and temperature-dependent shifts consistent with established PbV parameters, along with magnetic-field dependence data. In the revision we will move the key quantitative comparisons (ZPL position, linewidth, temperature shift) into the main text, add explicit magnetic-field sweep figures, and include a dedicated paragraph that places upper bounds on NV, SiV, and unknown-defect contributions by comparing observed intensities, lifetimes, and CPT contrast against control measurements on known defects. This will directly address the attribution uncertainty. revision: yes

  2. Referee: [Spin lifetime and CPT results] Spin lifetime and CPT results: the reported values of 12 ms (7.5 K) and 177 ns (6.5 K) appear without error bars, raw decay traces, fitting procedures, or temperature-calibration details, preventing independent verification of the headline numbers that underpin the comparison to other group-IV centers.

    Authors: We acknowledge that the main-text presentation of the 12 ms T1 and 177 ns T2* values is insufficiently detailed. The raw decay traces, exponential fitting procedures, and temperature-calibration protocol are already contained in the supplementary information. In the revised manuscript we will add the raw traces as a main-text figure or extended-data panel, report statistical error bars derived from repeated measurements, explicitly describe the fitting model and temperature sensor calibration, and reference the SI for full datasets. This will enable independent verification while preserving the headline comparison. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental measurements with no derivations or fitted predictions

full rationale

The paper reports direct experimental observations of spin lifetime (12 ms at 7.5 K), coherent population trapping for dark-state formation, and dephasing time (177 ns at 6.5 K) in PbV centers. No equations, derivations, or parameter fits are present that reduce to self-defined inputs, self-citations, or renamed known results. Identification of centers relies on spectral/magnetic signatures rather than any circular modeling step. The work is self-contained experimental reporting against external benchmarks (temperature, field dependence), with no load-bearing self-citation chains or ansatz smuggling.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Claims rest on standard interpretation of optical and magnetic resonance data plus accurate sample characterization; no free parameters or invented entities introduced.

axioms (1)
  • standard math Standard quantum mechanics governs spin dynamics and coherent population trapping in the PbV center.
    Invoked to interpret dark-state formation and lifetime measurements.

pith-pipeline@v0.9.1-grok · 5673 in / 1135 out tokens · 33230 ms · 2026-06-29T12:28:28.870814+00:00 · methodology

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Reference graph

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