01
Maintained reference
The dossier anchors itself to peer-reviewed CRS and Sr+ literature, explicit target classes, and a bounded comparison with conventional ion-trap methods.
Feasibility dossier
Endorsement marker: Local candidate framework - T(h)reehouse +EC stewardship. No external endorsement implied.
Clock-state targets in circular Rydberg atoms.
A Threehouse-aligned specimen page for the CRS feasibility dossier: explicit about what is maintained, what remains model-dependent, and what would falsify the programme.
The work does not position CRS as a replacement for trapped-ion clocks. It frames CRS as a differential probe of ionic-core structure under a differently sourced rank-2 perturbation, with feasibility gates stated up front rather than hidden in narrative optimism.
Interpretive frame
The dossier separates maintained claims from open correction channels.
The page follows the Threehouse layer logic directly: maintained reference, readable structure, and an explicit correction gate. That keeps the argument inspectable instead of collapsing signal, speculation, and programme branding into the same visual register.
02
Readable structure
A1, A2, B, B-deferred, and C remain distinct. Direct quadrupole extraction, model-dependent quantities, and non-competitive benchmark quantities are not aggregated into a false portfolio score.
EC
Correction gate
If the n-consistency check fails by more than 5 percent after identified corrections are applied, the programme reverts to model-validation status rather than precision extraction.
Priority targets
The strongest near-term claims stay close to demonstrated quadrupole coupling.
The target ordering follows the dossier's own selection rule: maximise directness of coupling to the Rydberg-generated gradient, signal size at demonstrated n, and shortness of the inference chain from spectroscopy to extracted quantity.
Research callout
The immediate programme is not "measure everything the platform touches." It is narrower: establish whether Theta(D3/2) and Theta(D5/2) can be extracted with a defensible uncertainty budget before moving to quantities that depend on a longer modelling chain.
A1: Theta(D3/2)
Lowest-hanging direct target. D3/2 coupling has already been demonstrated in the CRS context, making a first direct extraction plausible if sub-kHz spectroscopy and purity characterisation follow.
A1: Theta(D5/2)
Most clock-relevant state constant. The prospective gain is cleaner gradient provenance than in external ion-trap calibration, but only if the forward model survives cross-n consistency tests.
A2: E2 matrix elements
Scientifically attractive, but explicitly downstream of the quadrupole programme because the extraction depends on more modelling steps between observed signal and reported atomic-structure quantity.
Feasibility gates
The work stays useful only if the hard gates are met conjunctively.
These are not optional milestones. The dossier treats them as load-bearing conditions: spectroscopy, purity, stray-field control, and cross-n consistency each have to hold before a precision claim can be defended as more than a suggestive qualitative result.
DC-F1
Ionic-core spectroscopy at or below 1 kHz resolution. This is the most immediate technical bottleneck between present capability and usable extraction.
DC-F2
Circular-state purity high enough that admixture-induced gradient uncertainty stays below the target precision floor. State impurity is not a cosmetic correction.
DC-F3 / DC-F4
Stray-field-bounded gradient uncertainty below 1 percent of the quadrupole signal and agreement between extractions at n = 79 and n = 89 within mutual uncertainties.
Target table
The target register stays compact, semantic, and readable on small screens.
This summary table follows the Threehouse table rules directly: semantic headers, open edges, horizontal separators only, and stacked mobile fallback with `data-label` so the header context survives at narrow widths.
| Target | Current reading | Class |
|---|---|---|
| Theta(D3/2) of 88Sr+ | Best first direct extraction candidate because CRS coupling is already demonstrated. | A1 |
| Theta(D5/2) of 88Sr+ | Most clock-relevant target; cleaner gradient provenance is attractive if modelling holds. | A1 |
| E2 matrix elements | Interesting, but pushed behind quadrupole extraction because the inference chain is longer. | A2 |
| Differential tensor polarisability | Potentially separable in CRS geometry, but current resolution requirements keep it secondary. | B |
| Zeeman-sublevel shifts | CRS probes individual sublevel responses without the averaging that clock cancellation schemes impose. | B |
| Q(87Sr) nuclear quadrupole moment | Long inference chain and requires 87Sr CRS preparation not yet demonstrated. Retained for completeness. | B-def. |
| Scalar / BBR benchmark quantities | Explicitly non-competitive against present ion-clock results and excluded from the primary programme. | C |