Diamond & Quantum Weekly | Oct 5–11, 2026

The reporting window runs from 00:00 Beijing time on October 5 to 23:59 on October 11, 2026.

Weekly signal

This week’s developments cluster around a few traceable engineering questions: how diamond is integrated into cooling systems, how power devices degrade in harsh environments, and what rates and long-term stability quantum devices can actually achieve. Frore formally announced a cold plate with diamond integrated locally. On the research side, traceable data are available on radiation-induced degradation in diamond FETs, long-term stability in NV measurements and SiV heterogenous entanglement. Commercialization still requires further validation; test conditions, system-level benefit and failure mechanisms deserve closer attention.

1. Diamond enters a cold-plate product design

On October 7, Frore Systems announced LiquidJet Diamond. Rather than making the entire cold plate out of diamond, the design places a diamond heat spreader at a localized hotspot on the underside of the plate. The company says the complete solution can reduce GPU temperature by 16–22°C compared with a conventional skived-fin cold plate. These figures have not been independently verified and cannot be attributed entirely to diamond. Interface thermal resistance, thermal-cycle reliability and actual pump power still need to be assessed. There is also no evidence here of certification by a specific GPU vendor or volume delivery. Company announcement | Product information

2. A diamond-transistor reliability paper puts radiation tolerance in context

On October 6, Applied Physics Letters published a proton-irradiation study of hydrogen-terminated diamond FETs. At 5 MeV and a fluence of up to 1 × 10¹³ p/cm², the on-current fell by about 43%, while transconductance declined from 7.74 to 2.77 mS/mm. Materials potential does not mean a device will avoid degradation under harsh conditions. Paper

3. NV spin force moves a suspended, hundred-milligram-scale apparatus

The OIST study was formally published in Science Advances on October 7: spin-dependent forces from an NV ensemble produced a measurable classical center-of-mass displacement in a 128 mg apparatus. A preprint had appeared in May. This was not an experiment demonstrating a macroscopic quantum superposition. OIST report | Preprint

CVD diamond and MPCVD

One further optical-device experiment is worth noting. On October 5, Applied Physics Letters published a deep-ultraviolet vortex-beam device based on single-crystal diamond. Electron-beam lithography was used to fabricate the microstructures, followed by experimental validation in the deep-ultraviolet range. This is an optical-device prototype, not evidence of large-scale product delivery. Paper

Quantum technology

Faster heterogenous entanglement between SiV centers and ions

The October 7 arXiv submission 2610.10705 reports an average entanglement-generation rate of 1.03(1) kHz and a fidelity of 87.9(7)% for a photonic link between a ¹³⁸Ba⁺ ion and a diamond SiV⁻ center. This remains a preprint, not a commercial quantum network. Preprint

NV magnetometry: from sensitivity to reduced long-term drift

The October 5 preprint arXiv:2610.05907 proposes dual feedback with DQ 4-Ramsey. It reports a sensitivity of 7.0 pT/√Hz across 5–100 Hz, continuous operation for four hours, and a long-term noise floor of 64 fT/√Hz. These figures refer to different measurement conditions and should not be treated as interchangeable. Preprint

A diamond quantum device enters a teaching setting

On October 6, Karlsruhe University of Applied Sciences confirmed receipt of a quantum computer supplied by XeedQ for teaching in its newly launched bachelor’s program in quantum computing. The delivery is confirmed; it does not by itself establish the hardware scale, error-correction capability or computational performance. University announcement

Conferences and industry events

An updated attendee guide released on October 9 confirms that the 18th China Symposium on Diamond-Related Materials and Applications will take place October 14–16. Attendee guide

Social-media watch

Social media in China and overseas circulated diamond-cooling and quantum papers heavily this week, but reach is not the same as a first disclosure. Claims such as “NVIDIA certification,” “samples sent to TSMC” and “orders worth over RMB 100 million” are not included here without first-party evidence from a company or customer. A report published October 10 on selective control of diamond defects using 266 nm ultraviolet laser pulses is worth reading, but the paper’s first-online publication date has not yet been established; it remains on the full edition’s watchlist. Research coverage

What to watch next

For Frore’s cold plate, watch interface thermal resistance, pressure drop and pump power, thermal-cycle lifetime, and independent system testing; also verify the diamond plate’s crystal form, thickness and actual procurement. Continue tracking defect and degradation mechanisms in irradiated diamond FETs, as well as module-level replication of the SiV entanglement link.

Full-edition preview

The full edition adds the test boundaries behind Frore’s 770 W/cm² figure, radiation data for diamond devices, the Q factor and amplitude in the NV spin-force experiment, fidelity details for the SiV link, and an evidence-based resolution of journal online-publication versus issue dates.