Diamond & Quantum Weekly | Oct 12–18, 2026

The reporting window runs from 00:00 Beijing time on October 12 to 23:59 on October 18, 2026.

Weekly signal

One new preprint this week is directly relevant to thermal-management interfaces: it proposes a method for studying copper–carbon systems and their mechanical response. Its value lies in the method and the boundaries of the simulation. By contrast, several notable equipment-purchase, construction and investment-signing announcements in China mainly update project status; they do not yet change the assessment of how far functional-diamond applications have progressed toward deployment.

On the quantum side, Optica covered a GaP-on-diamond/SiV integrated device this week, but the research preprint had already been public since January. This brief records the society’s coverage as a communications milestone, not as a new experimental breakthrough this week.

1. A machine-learning potential links Cu–C deposition conditions to simulated interface mechanics

Submitted on October 13, Feiyu Zhou and co-authors introduced the NEP-CuC potential in a new preprint, trained on 2,727 configurations. In simulations under the specified conditions, increasing the incident copper deposition energy from 1 to 50 eV reduced the mean peak nominal tensile stress at the interface at 500 K from 12.35 ± 0.71 to 6.65 ± 0.98 GPa. This is a simulated tensile response—not a measurement of residual stress, bond strength or thermal boundary resistance (TBR). The work can help formulate process–interface hypotheses, but engineering application still requires experimental validation. Preprint

CVD diamond and MPCVD

Projects in China advance, but output and application validation remain open

On October 15, the second procurement for an 8-inch diamond MPCVD system for Peking University was reported as awarded. A reproduced award listing identifies Shenzhen Uplight Plasma Technology as the winner, with a reported price of RMB 6.5 million and model UP954; the full official award record was not available in this review. On the same day, China News Service reported that equipment had arrived for commissioning at Inner Mongolia Zhongqixin’s diamond-material project, its R&D center was in use, and a 6-inch polycrystalline diamond sample was displayed. Ordos High-Tech Zone reported on October 13 that the Guoxin Energy diamond project had been signed the previous day, with planned investment of RMB 5.7 billion. Peking University procurement notice | Reproduced award listing | Zhongqixin project report | Guoxin Energy project notice

These are three different stages: equipment award, on-site construction/commissioning, and project signing. They do not establish stable production of 8-inch electronic-grade single-crystal diamond, recurring heat-spreader deliveries from Zhongqixin, or realization of Guoxin Energy’s planned capacity. The next evidence to watch is equipment acceptance, qualified-wafer data and customer-side validation. Detailed technical requirements for the Peking University procurement were not fully available for review, so equipment frequency, power and uniformity should not be inferred.

Wiwynn shows an exploratory diamond microchannel-cooling concept

On October 12, Wiwynn introduced a package-level cooling design at the OCP Global Summit that directly bonds diamond composite material to silicon and integrates microchannels, with the aim of shortening the heat path from the chip. The company had discussed related research previously; this week it further described the integrated concept. Public information still lacks comparable thermal measurements and customer-validation data. Company announcement

Company disclosures show no clear commercialization-stage jump

On October 16, Guoji Precision Engineering reported company-stated thermal-conductivity figures for single-crystal diamond, polycrystalline diamond and diamond–copper. The measurement conditions were not uniform across those figures. The company also said that its civilian thermal-management products are undergoing cooperation-based validation with leading downstream customers. Some customer-delivery language from Worldia had already appeared in August. This brief does not count either item as evidence of a newly won major customer or mass production. Guoji Precision Engineering investor-relations record

Quantum technology

Optica covers a GaP-on-diamond/SiV hybrid photonic device

On October 15, Optica covered a hybrid photonic platform integrating GaP nanophotonic cavities with SiV centers in diamond. The preprint reports more than 600 cavities on diamond; of 640 devices selected for transfer, 637 were successfully transferred, a 99.5% stamp-transfer yield. A selected device demonstrated SiV spin–photon coupling and single-shot spin readout at about 4 K. This is not the final functional yield across all devices, much less the end-to-end yield of a quantum network. The research preprint first appeared on January 8, 2026; the journal’s exact first-online publication date has not yet been established. Optica coverage, October 15 | arXiv:2601.04733

Conferences, exhibitions and industry events

The mid-October Guilin symposium on diamond-related materials and applications covered topics including thermal management, MPCVD and processing. The OCP Global Summit took place in San Jose from October 12 to 15. Diamond liquid-cooling exhibits there should still be distinguished as company previews, demonstrations or independently measured results. Frore announced LiquidJet Diamond on October 7, so it is not counted again as a new event this week. Wiwynn’s OCP event information

Social-media watch

Among candidate items circulating on Chinese and international social media, SAXON Q’s NV quantum-algorithm result had already been reported in September, and XeedQ’s high-school education project was announced before this week. A claim about “300 Huanghe Whirlwind 915 MHz systems” lacked a verifiable first-party announcement for this reporting window and is not treated as hard news.

What to watch next

Three evidence trails merit follow-up: whether NEP-CuC simulations are compared against measured bond strength, TBR and thermal cycling; whether projects in China publish equipment acceptance, qualified-output and customer-test data; and whether GaP-on-diamond devices progress from transfer success to stable operation with multiple emitters and entanglement.

Full-edition preview

The full edition adds the training data and applicability boundaries of the Cu–C potential, the statistical conditions behind SiV readout results, a stage-by-stage review of the domestic projects, and a record of which disclosures and papers from the week were retained or excluded.

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Sources

• arXiv:2610.18545, October 13, 2026: NEP-CuC machine-learning potential and Cu–C simulations
• Peking University 8-inch diamond MPCVD system: second procurement notice; reproduced October 15 award listing
• China News Service, October 15, 2026: Inner Mongolia Zhongqixin project update
• Ordos High-Tech Zone, October 13, 2026: Guoxin Energy project-signing notice
• Wiwynn, October 12, 2026: OCP showcase and diamond microchannel concept
• Guoji Precision Engineering, October 16, 2026: investor-relations activity record
• Optica, October 15, 2026: GaP-on-diamond/SiV platform coverage
• arXiv:2601.04733, January 8, 2026: GaP-on-diamond spin–photon interface preprint