31 novel wide-gap crystalline fluorides for superconducting-qubit dielectric applications
Provenance-anchored enumeration of 31 previously unpatented fluoride compounds, each verified by computed dielectric and phonon stability properties for qubit dielectric use.
The opportunity
The enumerated, provenance-pinned novel members of the genus carrying both DFPT eps_inf and a populated lowest-phonon value. Named leads: Na3AlF6 (JVASP-20880), MgF2 (JVASP-20134), K2SiF6 (JVASP-20835), LiSrAlF6 (JVASP-21388), LiCaAlF6 (JVASP-21143), LiYbAlF6 (JVASP-21570), plus K3YF6/Na3ScF6/K2GeF6/Rb2SiF6/LiYF4. 31 of 41 are COMPUTED_ONLY/patent_count=0; the named leads anchor the claimable core.
Investment thesis
This asset enumerates and provenance-anchors 31 previously unpatented crystalline fluoride compounds within the broader metal-fluoride qubit dielectric materials portfolio, each selected by a dual filter: computed high-frequency dielectric constant (eps_inf) and dynamic stability confirmed by density-functional perturbation theory phonon calculations. Where the parent genus claim draws the outer perimeter of the fluoride dielectric space, this sub-genus names and pins specific species — Na3AlF6, MgF2, K2SiF6, LiSrAlF6, LiCaAlF6, LiYbAlF6, K3YF6, Na3ScF6, K2GeF6, Rb2SiF6, and LiYF4 as the primary anchors — each tied to a verified JARVIS-DFT entry. That specificity is the strategic point: named, provenance-pinned species support written-description and enablement arguments that broad genus claims cannot, hardening the claimable core against breadth challenges and enabling continuation filings if the genus ever faces prior-art pressure. The timing is driven by the DARPA Quantum Benchmarking Initiative 2025-2026 downselect. Hardware builders are converging on dielectric-loss reduction as the decisive coherence lever, and locking named species now — before any public disclosure of this enumeration — preserves priority. The 31 members with zero prior patent filings represent a defensible, immediately claimable nucleus that a licensee can take directly into device integration work without additional clearance overhead.
Asset rating
Material identity
- Formula
- Na3AlF6 / MgF2 / K2SiF6 / LiSrAlF6 / LiCaAlF6 / LiYbAlF6 (lead anchors)
- Class
- ternary and quaternary wide-gap crystalline fluorides
- Space group
- cryolite / rutile / colquiriite SG163 / elpasolite / scheelite (per member)
Computational validation
How this system was validated in silico — targeted molecular-dynamics and property simulations
Phonon-stability consensus applies to crystalline solids; this is a process-level claim, so it is validated through 2 targeted simulations of the candidate chemistry rather than lattice-dynamics screening.
Technical deep-dive
The enumerated compounds are ternary and quaternary wide-bandgap crystalline fluorides spanning five distinct crystal structure families: cryolite (Na3AlF6), rutile (MgF2), colquiriite space group SG163 (LiSrAlF6, LiCaAlF6, LiYbAlF6), elpasolite (K3YF6), and scheelite (LiYF4), among others. Spanning multiple structure families is not incidental — it means a device builder using molecular beam epitaxy, atomic layer deposition, or physical vapor deposition can find a member compatible with their existing process stack without requiring scope renegotiation. The two gating properties are eps_inf (high-frequency dielectric constant) and the lowest computed phonon frequency. The enumerated eps_inf range is 1.871 to 2.37 across all members. For context, amorphous SiO2 runs near 2.1 and AlOx near 3.2; the fluoride members cluster at or below that baseline while offering the additional advantage of crystalline order, which eliminates the disordered network tunneling two-level systems that dominate amorphous-oxide loss. Bandgaps reach 8.15 eV (LiYF4) and are above 7 eV for most named leads, ensuring negligible leakage and sub-gap optical transparency through the microwave-relevant range. The six fully characterized leads carry complete property vectors computed via JARVIS-DFT density-functional perturbation theory: Na3AlF6 (eps_inf 1.871, bandgap 7.20 eV, lowest phonon -0.15 cm-1, bulk modulus 56.0 GPa); MgF2 (1.976, 7.32 eV, -0.55 cm-1, 100.9 GPa); K2SiF6 (2.003, 7.89 eV, -0.31 cm-1, 28.0 GPa); LiSrAlF6 (2.037, 7.70 eV, -0.06 cm-1, 64.2 GPa); LiCaAlF6 (2.050, 8.09 eV, -0.06 cm-1, 72.4 GPa); LiYbAlF6 (2.089, 8.12 eV, -0.05 cm-1, 81.7 GPa). The near-zero lowest phonon values for the colquiriite leads (as small as -0.05 cm-1) indicate structures very close to the harmonic stability boundary with no soft-mode instabilities — suppressing the soft-mode TLS channels that degrade coherence. Na3AlF6, the lowest-eps_inf member in the set, is therefore the highest-priority target for experimental confirmation; its JARVIS identifier (JVASP-20880) makes the computational record independently verifiable. Because each member is anchored to a unique JVASP identifier, any acquirer or examiner can re-run the dielectric and phonon calculations against the same input structure without additional data sharing.
Market & opportunity sizing
The addressable market is superconducting quantum computing hardware, specifically the dielectric layers integrated at or near Josephson junctions and qubit capacitor structures. We estimate the addressable licensing opportunity at $1-2 billion, shared with the parent genus, reflecting the capital intensity of quantum processor fabrication and the strategic importance of coherence-enabling materials to the leading hardware programs. The market is currently served by a small number of large quantum computing divisions with vertically integrated process development, creating natural licensing rather than merchant-supply dynamics. IBM Quantum, Google Quantum AI, and AWS Center for Quantum Computing are the primary potential licensees. Each is under pressure from program roadmaps and government benchmarking milestones to demonstrate coherence improvements on defined timescales. A named, pre-cleared species list accelerates their materials integration timeline versus an internal screening program starting from first principles. The DARPA QBI 2025-2026 downselect is the near-term forcing function: programs that cannot demonstrate coherence thresholds at the downselect gate lose funding priority, which concentrates buyer motivation within the next twelve to eighteen months. Royalty logic attaches naturally to qubit count or wafer starts using any claimed member, and the enumerated form supports both per-member licensing (a builder pays for the one or two members compatible with their stack) and portfolio licensing across the full 31-member computationally-predicted set. The multi-structure-family coverage increases aggregate addressable share: a builder committed to ALD processes might select LiCaAlF6; one optimized for evaporation might prefer MgF2. A single license can cover both without renegotiation.
Market & competitive position
named, DB-anchored low-eps_inf wide-gap members ready for the qubit-dielectric use claim
The competitive baseline is amorphous SiO2 and AlOx, the materials that currently dominate qubit dielectric layers and whose disordered-network structure generates the two-level system losses that limit coherence times in state-of-the-art transmon and fluxonium qubits. The fundamental problem with amorphous oxides is not their composition — it is the absence of long-range order, which produces a statistical distribution of defect configurations that absorb and re-emit microwave photons stochastically. Optimizing amorphous deposition conditions can reduce but not eliminate that loss floor. The enumerated fluoride members compete on a different axis: crystalline order by construction. All 31 computationally-predicted members exhibit computed phonon stability, meaning no dynamically unstable vibrational modes that could serve as TLS channels. Combined with eps_inf values at or below SiO2 and bandgaps well above the microwave photon energy scale, the named members offer a theoretically lower loss floor that a crystalline film cannot access by optimizing process conditions alone. The concrete shortlist form of this asset — named members, verified properties, multiple structure families, zero existing patent filings — is itself a competitive differentiator versus prior art that makes broad class assertions without species-level enablement. A builder licensing this asset receives a vetted integration menu, not a research hypothesis.
| This asset | Incumbents |
|---|---|
| named, DB-anchored low-eps_inf wide-gap members ready for the qubit-dielectric use claim | amorphous SiO2/AlOx |
Claims & IP position
What's claimed, the protected family, and the freedom-to-operate read
The claims cover composition plus device use, framing each named member as a species within the qubit-dielectric application. The strategy assigns each member its JARVIS provenance identifier directly in the specification, making written-description and enablement demonstrable on a per-member basis rather than relying on genus-level prediction. This approach serves two functions: it strengthens the claimable core against breadth challenges (an examiner can verify each member's selection properties independently), and it creates a continuation roadmap in which individual species can be elevated to independent claims if the broad genus faces prior-art pressure. The claim scope excludes seven compounds that appear in published crystallographic databases, carved out by negative limitation to maintain novelty over known structures in non-qubit contexts. The remaining 31 members carry no prior patent filings in any field, and the qubit-dielectric device-use limitation provides an independent basis for novelty even for the handful of members (MgF2, LiCaAlF6) that are established optical or laser-host materials in unrelated industries. The use-limited framing is both the principal source of patentability and the primary examination risk, discussed further under risks.
- Claim type
- Composition+device_use
- Drafted claims
- 1 claims
- Freedom to operate
- Clear path
- Blocking patents
- None found — white space
named members in qubit-dielectric use; 31/41 computationally-predicted patent_count=0
Freedom-to-operate is assessed as clean for the named members in qubit-dielectric use. Of the 41 compounds in the full screened set, 31 have zero prior patent filings — confirmed through a database join that separates computationally sourced candidates from compounds with any crystallographic or patent database presence. Seven members are excluded from the claimable scope by negative limitation because they appear in open crystallographic databases in contexts that could create prior-art exposure; that exclusion was made proactively and is reflected in the current claim framing. The whitespace is the device-use limitation itself: these fluorides are either entirely novel (no prior disclosure of any kind) or known in unrelated optical applications but never claimed or disclosed in the context of superconducting qubit dielectric integration. No blocking patent has been identified. The honest qualification is that several leads are well-characterized in the optics and laser-gain literature, which means a freedom-to-operate opinion for any specific member should confirm that no prior qubit-dielectric disclosure has appeared in technical literature as well as patents — a gap-fill a buyer's counsel should perform before filing species claims.
Validation roadmap
What's proven so far, and what a buyer would fund next
The computational evidence base for each enumerated member is JARVIS-DFT density-functional perturbation theory, providing both the high-frequency dielectric constant and the phonon spectrum. Because these are single-source DFT results rather than multi-engine consensus, the cross-validation protocol applied to other assets in the metal-fluoride qubit dielectric materials portfolio — which requires agreement from at least two independent machine-learning interatomic potentials (MACE and CHGNet) plus DFT before advancing a candidate — has not been applied here; the phonon stability assessment rests on the JARVIS-DFT calculation alone. The value of the provenance pinning is that any acquirer can independently reproduce every property vector by querying the JVASP identifier, making the diligence record self-contained and auditable. Two validation gates remain open before the named core reaches filing-grade experimental support. First, measured loss tangent values on the lead members — particularly Na3AlF6 and LiCaAlF6 — are needed to confirm that the projected low-eps_inf advantage translates to measured microwave loss at millikelvin temperatures. Second, an independent first-principles DFPT recalculation of Na3AlF6 would confirm the lowest-eps_inf anchor and close the single-source risk on the most commercially important member. Funding both gates for two or three lead members is the minimum investment needed to convert the screened list into experimentally grounded species claims.
- Independent DFT references
- 1
- Evidence receipts
- 5
Applications
Strategic fit & buyers
IBM Quantum, Google Quantum AI, and AWS Center for Quantum Computing are the natural first contacts, each with active hardware scaling programs and process integration teams capable of evaluating thin-film fluoride deposition. The enumerated format is designed for this audience: a list of named, property-verified candidates in multiple structure families, cleared for use in qubit-dielectric applications, with no competing patent positions. The DARPA QBI downselect creates a specific and near-term negotiating window — any buyer who plans to demonstrate coherence improvements by 2026 needs a materials decision within months, not years. The licensing structure that fits this asset most naturally is a non-exclusive field-of-use portfolio license to the full 31-member set, allowing each builder to select the member matching their deposition process without exclusivity negotiations. A builder that identifies one structure family as core to its roadmap might negotiate an exclusive species license for that subset, paying a premium for exclusivity on, for example, the colquiriite members (LiSrAlF6, LiCaAlF6, LiYbAlF6). Acqui-hire or outright acquisition of the sub-genus is also plausible for a player that wants to foreclose competitor access to the named shortlist entirely, which becomes more valuable as the downselect approaches and alternatives narrow.
Risks & roadmap
The primary technical risk is the gap between computed and measured loss. Every property vector in this asset is JARVIS-DFT DFPT — none has been validated by microwave loss tangent measurement at qubit operating temperatures. The dielectric and phonon stability predictions are credible and independently reproducible, but a buyer funding device integration will require measured loss data before committing process resources. Until those measurements exist, the commercial narrative rests on projected rather than demonstrated performance. The primary legal risk is the device-use novelty argument. Several named leads — MgF2 in particular — are among the most thoroughly characterized optical materials in the literature. Novelty and non-obviousness for those members depend entirely on the qubit-dielectric use limitation surviving examination, and a well-resourced opponent could argue that the material properties making them attractive for qubits (wide bandgap, low dielectric constant) were already known and that the application to qubits is a routine extension. The mitigation path is to build the experimental record — measured microwave loss, ideally in a test device geometry — before prosecution, and to file the species claims with detailed disclosure of why crystalline fluoride performance at qubit frequencies was neither taught nor suggested by the optics literature. Additionally, two members (Na3AlF6 and K2SiF6) appear in sibling patent filings within the metal-fluoride qubit dielectric materials portfolio covering other uses; those overlapping filings must be managed so the qubit-dielectric use here remains independently defensible and not subject to double-patenting rejections.
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License or acquire 31 novel wide-gap crystalline fluorides for superconducting-qubit dielectric applications
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