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Qualified yes. A 2024 APL Photonics study found that nitrogen-vacancy (NV) centers made by femtosecond-laser writing, then thermal annealing, had spin-coherence properties comparable to native NV centers while integrated into diamond waveguides.
That result supports preservation of the measured NV spin coherence through the demonstrated fabrication process. It does not prove that every quantum state near a laser-written defect remains coherent, nor that every laser recipe, diamond grade or defect will perform the same way.
What the question means in practice
The defect being studied
An NV center is a point defect in diamond: a nitrogen atom occupying a lattice site next to a missing carbon atom (a vacancy). Its electron-spin states can be initialized, manipulated with microwaves or light, and read optically. Those properties make NV centers useful as quantum sensors, network interfaces and components in photonic devices.
“Laser-created diamond defect” is therefore not a generic category in the strongest evidence available. The central demonstrated case is a laser-written NV center that is subsequently activated by annealing and coupled to a waveguide.
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What coherence means here
Quantum coherence is not a single number. Experiments commonly distinguish:
- T2 (Hahn-echo coherence): how long a controlled spin superposition survives when a refocusing pulse removes some slowly varying noise.
- T2* (free-induction or inhomogeneous dephasing time): the shorter apparent coherence time without that refocusing operation.
- Rabi-decay time: how quickly oscillations driven by a resonant control field lose contrast.
- T1 (longitudinal relaxation): the time for the spin population to return toward thermal equilibrium. It is a relaxation metric, not a direct substitute for T2.
The 2024 result concerns the measured spin coherence of the NV centers themselves. It should not automatically be read as a measurement of coherence in nearby nuclear spins, neighboring defects, photons, or every environmental degree of freedom.
What the 2024 waveguide experiment demonstrated
Guo and coauthors reported the relevant study in APL Photonics 9(7), article 076103, published online July 1, 2024. They investigated both single and ensemble NV centers integrated with diamond waveguides. The fabrication route combined femtosecond laser writing with a later thermal-annealing step.
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The laser was used to define structures and defect locations inside the diamond. Annealing then supplied the thermal conditions needed to mobilize vacancies and form optically active NV centers. The resulting emitters were tested in the photonic structure rather than in an isolated, unprocessed crystal.
The authors state that the investigated centers’ spin-coherence properties were comparable to those of native NV centers. In this context, “native” means defects that occur or are produced without the same laser-written waveguide fabrication history. The comparison supports the conclusion that the demonstrated processing did not measurably destroy the NV spin coherence under the tested conditions.
It is an experimental comparison, not a guarantee. “Comparable” depends on which native reference, diamond material, temperature, optical geometry and pulse sequence are used. A result for an ensemble also cannot be treated as a specification for every single center.
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How the key studies fit together
The following results come from different samples and protocols. Their numbers are useful for scale, but they are not a single performance ranking.
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|---|---|---|---|
| APL Photonics, 2024 (Guo and coauthors) | Single and ensemble NV centers integrated with waveguides; femtosecond laser writing followed by thermal annealing | Spin-coherence properties reported as comparable to native NV centers | Direct evidence that the measured NV spin coherence survived this integrated fabrication route; no blanket claim about all nearby quantum states |
| Optica, 2019 | Individually laser-written NV defects | Hahn-echo T2 examples of 170, 100 and 10 microseconds | Shows substantial center-to-center variation. The authors linked the spread to substitutional-nitrogen inhomogeneity and strain from defects; residual local damage was relatively minor in the measured examples |
| Nature Photonics, 2016 | Controlled single negatively charged NV centers generated by laser writing and annealing | Success probability up to 45 ± 15%; centers within about 200 nanometers of the target in the transverse plane; selected centers had stable, coherent optical transitions at cryogenic temperature | Demonstrates placement and optical-quality potential for a specific process, not a universal yield or accuracy specification |
| Nano Letters, 2025 | Femtosecond-laser-written integrated photonic diamond chip; ensemble measurements | Rabi-decay time approximately 1 microsecond, T2* approximately 0.5 microsecond, T2 approximately 5 microseconds and T1 approximately 5 milliseconds | Measured regions had comparable ensemble spin parameters, leading the authors to infer no detectable ensemble-coherence degradation from their writing process |
Because these experiments use different diamond material, defect densities, temperatures, optical designs and pulse sequences, comparing the raw microsecond values as though they were interchangeable would be misleading. A Hahn-echo T2 is not the same observable as T2* or Rabi decay, and a single-center result is not an ensemble average.
Why laser writing can preserve coherence—and why it can also hurt it
Benefits of writing inside the device
Femtosecond pulses can deposit energy in a tightly confined volume, allowing three-dimensional patterning of waveguides and defect-generation sites. That integration can improve optical collection and place an emitter near the photonic mode where it is useful. Avoiding a separate pick-and-place step also reduces alignment between a pre-existing defect and the finished waveguide.
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Potential sources of decoherence
Laser processing can leave vacancies, reconstructed regions, graphitic or amorphous damage and local strain. These changes may introduce fluctuating magnetic or electric fields, alter the NV charge state, or broaden optical transitions. Substitutional nitrogen elsewhere in the crystal is another magnetic-noise source. The 2019 Optica measurements associated their 170-, 100- and 10-microsecond Hahn-echo values with differences in nitrogen concentration and strain fields from defects, illustrating why nearby material quality matters.
What annealing contributes
Thermal annealing allows mobile vacancies to combine with substitutional nitrogen, creating NV centers and repairing or transforming some laser-induced damage. The temperature, duration, atmosphere and subsequent cleaning determine how much residual disorder remains. Annealing is therefore part of the quantum-device process, not merely a cosmetic post-treatment.
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“Nearby coherence” is a narrower claim than it sounds
A laser-written NV center can retain its own electron-spin coherence while still disturbing another quantum system close by. For example, an experiment could find a normal NV T2 but not test a nearby carbon-13 nuclear spin, another NV, a spin bath or a photon stored in the waveguide. Conversely, a local environment could support a long-lived nuclear-spin memory even when the NV electron spin has a shorter measured T2.
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The 2024 waveguide study establishes the first, narrower proposition: the measured NV spin-coherence properties were comparable with native centers in that experiment. Evidence for coherence of a neighboring system would require a separate measurement that prepares and reads that system, reports its protocol and compares it with an appropriate unprocessed reference.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to evaluate a laser-written diamond device
If you are assessing a new process or a published device, use a matched checklist rather than a single headline number:
- Identify the defect and charge state. Confirm whether the result concerns a single negatively charged NV center, another charge state or an ensemble.
- Record the fabrication sequence. Note laser pulse conditions when given, writing geometry, annealing temperature and duration, cleaning and any surface treatment.
- Match the coherence protocol. Compare Hahn-echo T2 with Hahn-echo T2, and T2* with T2*. Do not substitute T1 for a dephasing result.
- Separate single-center and ensemble data. An ensemble average can hide poor performers and does not predict the best or worst individual center.
- Check the material environment. Look for nitrogen concentration, isotope composition, strain mapping, defect density and evidence of graphitic or amorphous damage.
- Check operating conditions. Temperature, magnetic-field orientation, microwave power and optical excitation can all change the measured value.
- Compare a local native control. The strongest claim comes from laser-written and native centers in the same diamond, tested with the same pulse sequence and readout geometry.
- Test the neighboring system separately. If the application depends on a nuclear spin, a second defect or a photonic memory, measure that degree of freedom instead of inferring it from the NV electron-spin result.
What the reported numbers mean for system design
Single-defect placement and yield
The 2016 Nature Photonics work reported a maximum controlled-generation success probability of 45 ± 15% and transverse placement within about 200 nanometers of the intended position. Those figures help quantify the engineering trade-off: deterministic placement is valuable for coupling to a waveguide, but each fabrication run may still require screening and selection. The values apply to that study’s process and should not be used as a general manufacturing guarantee.
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The 2019 single-center Hahn-echo examples span 10 to 170 microseconds. A design requiring repeated gate operations or sensing during a fixed interval must use the lower-tail behavior of its own device population, not the best reported center. The 2025 ensemble values—approximately 0.5 microsecond for T2* and 5 microseconds for T2—illustrate how an ensemble’s inhomogeneity can limit unrefocused control even when relaxation remains about 5 milliseconds.
Photonic integration versus material purity
Waveguides improve access to light but add interfaces, strain and fabrication steps. The useful comparison is therefore system-level: optical collection, placement, charge stability and coherence measured together. A slightly shorter coherence time may be acceptable if the integrated geometry substantially improves photon collection or readout fidelity; that is an application decision, not evidence that the process is universally better or worse.
What remains unresolved
- Whether the 2024 process preserves coherence of nearby nuclear spins or other defects was not established by the reported NV spin comparison.
- The cited studies do not define one universal laser recipe that works across all diamond nitrogen concentrations, strain conditions or waveguide designs.
- Reported yields, placement errors and coherence times are sample-specific. They do not provide a population-wide manufacturing specification.
- Long-term stability, charge-state switching and coherence under the exact temperatures and optical powers of a deployed system require application-specific testing.
The most defensible summary is therefore precise: femtosecond laser writing followed by annealing can produce waveguide-integrated NV centers whose measured spin coherence is comparable to native centers, as demonstrated in 2024. Earlier and later studies show that placement, yield and coherence vary with material and protocol. Claims about “nearby quantum coherence” beyond the NV spin require direct measurements of the neighboring quantum system.
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