---
type: source
title: "Temperature Below 30 mK Achieved by Adiabatic Demagnetization Refrigeration Using KYb3F10"
author: "Qiao-Fei Xu, Xin-Yang Liu, et al. (Journal of the American Chemical Society)"
url: https://pubs.acs.org/doi/10.1021/jacs.5c10483
date: 2025-07-30
domain: space-development
secondary_domains: []
format: journal-article
status: processed
priority: high
tags: [helium-3, ADR, adiabatic-demagnetization, quantum-computing, cryogenics, he3-alternatives, cislunar-resources, interlune]
---

## Content

**Published:** July 30, 2025. Journal of the American Chemical Society, Vol. 147, Issue 30, pages 27089-27094.

**Authors:** Qiao-Fei Xu, Xin-Yang Liu, Ruo-Tong Wu, Ming-Yang Fu, Man-Ting Chen, Jun-Sen Xiang, Yin-Shan Meng, Tao Liu, Pei-Jie Sun, La-Sheng Long, and Lan-Sun Zheng (Chinese research team).

**Core finding:** A new frustrated magnet material, **KYb3F10**, achieves a minimum ADR temperature of **27.2 mK** under a 6 T magnetic field. This is below 30 mK — the first time ADR using this material class has been shown to reach this temperature range in laboratory testing.

**Key specifications:**
- Material: KYb3F10 (frustrated magnet — ytterbium fluoride)
- Minimum temperature achieved: 27.2 mK at 6 T field
- Magnetic entropy change: surpasses commercial ADR refrigerants by 146% and 219% respectively on two key metrics
- Magnetic ordering temperature: below 50 mK (confirming ability to operate at these temperatures)
- Method: Adiabatic demagnetization refrigeration (ADR) — no helium-3 required

**Context on superconducting qubit requirements:**
- Most state-of-the-art superconducting qubit systems operate at or below 20 mK
- Typical dilution refrigerator operating temperature for quantum computers: ~10-15 mK
- 27.2 mK is approaching but not yet within the standard operating range for superconducting qubits
- The gap between 27.2 mK (achieved) and 10-15 mK (needed) is much smaller than the gap between commercial ADR (100-300 mK) and qubit requirements

**Significance for He-3 substitution thesis:**
This paper is significant evidence that ADR-based He-3-free alternatives are approaching superconducting qubit operating temperatures. Prior to this work, the best He-3-free ADR systems reached 100-300 mK (Kiutra commercial products), making them clearly insufficient for superconducting qubits. KYb3F10 at 27.2 mK narrows the gap from 4-10x to approximately 2x (27.2 mK vs. 10-15 mK target).

## Agent Notes
**Why this matters:** This is the decisive technical evidence for the ADR temperature floor question flagged as HIGH PRIORITY in session 2026-03-19. The question was whether He-3-free ADR could reach superconducting qubit temperatures (10-25 mK), or whether it plateaus at 100-500 mK. This paper shows a research ADR system at 27.2 mK — approaching the 10-25 mK range. This significantly updates the He-3 substitution timeline.

**What surprised me:** The research is from a Chinese team — consistent with Pattern 7 (China has independent geopolitical incentive to develop He-3-free ADR, reducing dependence on US/Russia tritium stockpiles for domestic quantum computing). The JACS paper was published just two weeks after DARPA's January 2026 urgent call (January 27) — the DARPA call may have surfaced this existing research direction.

**What I expected but didn't find:** I could not access the full paper text (403 error). The 27.2 mK figure comes from search engine summary. I could not confirm: (a) whether this is single-shot or continuous cooling; (b) cooling power at 27.2 mK; (c) field requirements for commercial-scale systems; (d) vibration profile (critical for qubit coherence).

**KB connections:**
- [[space governance gaps are widening not narrowing because technology advances exponentially while institutional design advances linearly]] — He-3 demand substitution is itself a technology-advancing-faster signal
- Pattern 4 (He-3 as first viable cislunar resource product): The temporal bound on He-3 demand is real but the substitution risk timeline must be recalibrated

**Extraction hints:**
- **Primary claim candidate:** "Research ADR systems using frustrated magnet KYb3F10 achieved 27.2 mK in July 2025 — approaching but not yet within superconducting qubit operating temperatures (10-25 mK) — demonstrating that He-3-free cooling is on a trajectory to reach qubit requirements, not plateauing at 100-500 mK as previously assumed"
- **Confidence:** speculative-to-experimental — result is real but commercial viability at qubit temperatures remains undemonstrated
- **Scope qualifier:** laboratory conditions (6T field), single result — does not prove commercial deployability
- **Context:** Should be read alongside Kiutra LEMON project (also approaching sub-30 mK via continuous ADR) — two independent research programs converging on the same temperature frontier

## Curator Notes
PRIMARY CONNECTION: Pattern 4 (He-3 demand temporal bound) — this is the key technical evidence on the He-3 substitution timeline
WHY ARCHIVED: Most important technical finding of the session — resolves the "does ADR plateau at 100-500 mK?" question with evidence that research ADR is now approaching superconducting qubit temperatures
EXTRACTION HINT: Focus on the gap between 27.2 mK achieved and 10-15 mK needed — this gap (~2x) is much smaller than the commercial ADR gap (100-300 mK, or 4-10x). Extractor should calibrate substitution timeline: research at 27 mK now, commercial products likely 5-8 years from here.
