This paper establishes the 4-square merkabit substrate as a content-addressable memory register on present-day superconducting hardware. Where Paper 31 specifies how trit information is written into the lattice via the cross-chiral tunnel, Paper 32 specifies how it is held and read out — the memory-side counterpart to the cross-chiral write primitive in the Merkabit Research Series. The substrate. Four 4-spinor tesseract merkabits arranged on a closed perimeter ring (N = 4, 17 qubits including SWAP-test ancilla), with cross-chiral tunnels iSWAP^J(u_i, v_{i+1 mod N}) on every edge at J = 0.1, executing Protocol 4S internal chiral dynamics on each cell. The geometry is forced rather than chosen: the 4-square is the smallest closed register on the Eisenstein lattice ℤ[ω] that admits both bond-level locality (inherited from Paper 31's universal 9-entry lookup table) and a complete Z₃ address space of 3⁴ = 81 ternary patterns. Two complementary measurements establish the register. Persistence. Six deterministic memory configurations M1–M6, spanning mixed labels and two of three uniform Z₃ classes, produce bond-pattern fingerprints that remain mutually distinguishable across horizons n ∈ {1, 2, 3, 5, 10} Coxeter periods at p_depol = 0.005. Mean pairwise distances grow from 0.70 at n = 1 to 0.84 at n = 3 — an early-period amplification feature structurally analogous to the first layers of a trained neural network, but achieved without training — before slow decay to 0.51 at n = 10. All six memories remain mutually distinguishable across every horizon tested. Capacity. Full enumeration of the 3⁴ = 81-pattern address space at the peak-distinguishability horizon n = 3 and the hardware-viable horizon n = 1 yields 51 mutually distinguishable patterns at the 3σ shot-noise floor for 4096-shot SWAP-test readout — approximately 5 classical bits of ternary content held on the substrate without external scaffolding. Section 5 calibrates the 4-square damping factor at p_depol = 0.005 (Willow- and Eagle-realistic) on three representative patterns to fix the operational margin. The register meets the three substrate-level requirements of an associative memory: content-specific distinguishability, temporal persistence of distinct content over multiple Coxeter periods, and a complete addressable alphabet. Distinguishability between memories actually grows for the first three Coxeter periods before noise damping dominates — a Hopfield-style early-amplification regime that is architectural, not engineered. Observable 18 pre-registers the persistence + capacity result on IBM Eagle r3 / Heron r2 (17 qubits, ≈ 25 QPU-min) with explicit pass/fail thresholds anchored to a public commit SHA. Each threshold names the specific structural primitive — content-specific distinguishability, temporal persistence, or ~5-bit capacity at moderate discriminability — that is falsified if the threshold fails. Position in the Merkabit Research Series. Papers 24–26 confirmed 5/5 pre-registered single-cell hardware predictions on IBM Eagle r3 and Heron r2, including the sub-Poissonian Fano signature F = 0.856 ± 0.030 at 131σ below Poisson. Paper 31 establishes the cross-chiral tunnel as the directional ternary write primitive and demonstrates topology-independence of its 9-entry lookup table across triangle, 4-square, and hexagon rings. Paper 32 closes the memory-side of the substrate at the 4-square scale, establishing persistence and capacity as the empirical content of the merkabit's associative-memory register. Paper 33 composes the write primitive and the memory register into a primitive-complete 19-qubit self-hosting quantum computer with a native Z₃ cyclic clock α → γ → β → α (Pentachoric Verification Protocol, Observable 22). Paper 34 extends the architecture to two coupled compute triangles on 28 qubits and reports the cyclotomic Z₃ ternary spectrum predicted by Paper 7's complementary Regime 2 framework.
This paper establishes the 4-square merkabit substrate as a content-addressable memory register on present-day superconducting hardware. Where Paper 31 specifies how trit information is written into the lattice via the cross-chiral tunnel, Paper 32 specifies how it is held and read out — the memory-side counterpart to the cross-chiral write primitive in the Merkabit Research Series. The substrate. Four 4-spinor tesseract merkabits arranged on a closed perimeter ring (N = 4, 17 qubits including SWAP-test ancilla), with cross-chiral tunnels iSWAP^J(u_i, v_{i+1 mod N}) on every edge at J = 0.1, executing Protocol 4S internal chiral dynamics on each cell. The geometry is forced rather than chosen: the 4-square is the smallest closed register on the Eisenstein lattice ℤ[ω] that admits both bond-level locality (inherited from Paper 31's universal 9-entry lookup table) and a complete Z₃ address space of 3⁴ = 81 ternary patterns. Two complementary measurements establish the register. Persistence. Six deterministic memory configurations M1–M6, spanning mixed labels and two of three uniform Z₃ classes, produce bond-pattern fingerprints that remain mutually distinguishable across horizons n ∈ {1, 2, 3, 5, 10} Coxeter periods at p_depol = 0.005. Mean pairwise distances grow from 0.70 at n = 1 to 0.84 at n = 3 — an early-period amplification feature structurally analogous to the first layers of a trained neural network, but achieved without training — before slow decay to 0.51 at n = 10. All six memories remain mutually distinguishable across every horizon tested. Capacity. Full enumeration of the 3⁴ = 81-pattern address space at the peak-distinguishability horizon n = 3 and the hardware-viable horizon n = 1 yields 51 mutually distinguishable patterns at the 3σ shot-noise floor for 4096-shot SWAP-test readout — approximately 5 classical bits of ternary content held on the substrate without external scaffolding. Section 5 calibrates the 4-square damping factor at p_depol = 0.005 (Willow- and Eagle-realistic) on three representative patterns to fix the operational margin. The register meets the three substrate-level requirements of an associative memory: content-specific distinguishability, temporal persistence of distinct content over multiple Coxeter periods, and a complete addressable alphabet. Distinguishability between memories actually grows for the first three Coxeter periods before noise damping dominates — a Hopfield-style early-amplification regime that is architectural, not engineered. Observable 18 pre-registers the persistence + capacity result on IBM Eagle r3 / Heron r2 (17 qubits, ≈ 25 QPU-min) with explicit pass/fail thresholds anchored to a public commit SHA. Each threshold names the specific structural primitive — content-specific distinguishability, temporal persistence, or ~5-bit capacity at moderate discriminability — that is falsified if the threshold fails. Position in the Merkabit Research Series. Papers 24–26 confirmed 5/5 pre-registered single-cell hardware predictions on IBM Eagle r3 and Heron r2, including the sub-Poissonian Fano signature F = 0.856 ± 0.030 at 131σ below Poisson. Paper 31 establishes the cross-chiral tunnel as the directional ternary write primitive and demonstrates topology-independence of its 9-entry lookup table across triangle, 4-square, and hexagon rings. Paper 32 closes the memory-side of the substrate at the 4-square scale, establishing persistence and capacity as the empirical content of the merkabit's associative-memory register. Paper 33 composes the write primitive and the memory register into a primitive-complete 19-qubit self-hosting quantum computer with a native Z₃ cyclic clock α → γ → β → α (Pentachoric Verification Protocol, Observable 22). Paper 34 extends the architecture to two coupled compute triangles on 28 qubits and reports the cyclotomic Z₃ ternary spectrum predicted by Paper 7's complementary Regime 2 framework.
This paper composes the primitives established in Papers 31 and 32 into a primitive-complete, self-hosting quantum computer on 19 qubits — a categorically stronger claim than the substrate-of-physics claim of the Merkabit Research Series (Papers 1–28) or the hardware-confirmation claim of Papers 24–26. Every operation required for computation — write, compute, communicate, store, retrieve, and clock — reduces to native merkabit dynamics. No external gate library is required. The architecture does not enable a computer built on top of it; it is the computer. The 19-qubit footprint. Three 4-spinor tesseract merkabits in a closed compute triangle (12 qubits) with cross-chiral tunnels at J_intra = 0.1 on every triangle edge; one database merkabit D coupled to merkabit C through a memory-bus tunnel at J_mem ∈ [0.5, 1.0] (4 qubits); a 2-qubit Z₃-eigenstate reference register; one SWAP-test ancilla. The compute triangle and the memory bus are the same operator (iSWAP^J) at two different coupling strengths — the architecture is uniform under computation, with what distinguishes compute from storage being coupling rate rather than gate type. The native computation is the Z₃ cyclic clock. Composing three triangle-edge tunnels with one memory tunnel produces, as an emergent computational output, the Z₃ Galois rotation α → γ → β → α: writing label X produces a stored state on v_D that recognises cycle(X) = X⁻¹. Three writes return to the original label. The clock was not programmed; it falls out of the architecture's own Z₃ symmetry group acting on its own primitive set. This is the first result in the series in which the architecture's computational output is itself a structural signature of its symmetry group. The Pentachoric Verification Protocol (Observable 22). Five simulation stages map one-to-one onto the five gates of the ouroboros cycle of Paper 24: Substrate (S), Rotation (R), Transfer (T), Frequency / self-sustainment (F), Phase (P). Each gate is a single independent pass/fail test on the 19-qubit circuit; failure of any single gate falsifies one specific named primitive, and the failure pattern across {S, R, T, F, P} localises which compositional step did not survive hardware noise. The decisive gate is R: it asks whether writing label X returns a state that recognises cycle(X) under the Z₃ permutation. Sub-thresholds for all five gates are anchored to public commit SHAs. Cross-architecture simulation results. All five gates pass at three noise profiles: ideal cirq.Simulator (R = +0.159 ± 0.004 at +39.7σ), IBM Heron r2 (p_depol = 0.003, R = +0.110 at +3.56σ), and IBM Eagle r3 (p_depol = 0.005, R = +0.086 at +3.06σ). Willow's published gate fidelities sit between these two operating points; the expected hardware verdict is STRONG PASS or WEAK PASS at the full 19-qubit tier. Cross-architecture pre-registrations for Willow and IBM are deposited in parallel with identical thresholds, anchored to timestamped git SHAs prior to hardware access. The octonion / 8-spinor layer is not required. Earlier drafts placed storage inside an octonionic envelope to leverage Paper 27's interior-volume expansion factor; in simulation, the octonion's Coxeter attractor thermalises content across the envelope boundary and degrades readout contrast. The tesseract-only architecture reported here recovers cleaner readout on strictly fewer qubits. The octonion layer remains relevant for the gravity-sector physics of Papers 20 / 27 / 28 but is not part of the QC-architecture proposal. Position in the Merkabit Research Series. Papers 24–26 confirmed 5/5 pre-registered single-cell hardware predictions on IBM Eagle r3 and Heron r2. Paper 31 establishes the cross-chiral tunnel as the directional ternary write primitive with topology-independence across triangle / 4-square / hexagon rings. Paper 32 establishes the 4-square substrate as a content-addressable memory register holding ~5 bits across 10 Coxeter periods. Paper 33 composes write, communicate, store, retrieve, and clock into a primitive-complete 19-qubit quantum computer with native Z₃ cyclic clock. Paper 34 extends the architecture to two coupled compute triangles on 28 qubits and reports the cyclotomic Z₃ ternary spectrum predicted by Paper 7's Regime 2 framework.
Two 4-spinor tesseract merkabits coupled through a partial iSWAP^J between the forward spinor of A and the inverse spinor of B produce an ordered-pair Z₃ × Z₃ correlation that is inaccessible to any local observable on either merkabit alone. Under Protocol 4S internal dynamics — three isoclinic rotation planes plus the chiral P gate — at J = 0.1 and n = 2 Coxeter periods, the input pair (β, γ) gives tunnel coherence 0.000 ± 0.000 via destructive interference while the reversed pair (γ, β) gives 0.762 ± 0.005, a 166σ directional gap on Cirq state-vector simulation (125σ on Qiskit Aer). The cross-chiral tunnel is a directional ternary gate: its rule lives in the channel between merkabits, not in either merkabit individually. Replicating the two-merkabit protocol on three ring topologies — triangle (N = 3, 13 qubits), 4-square (N = 4, 17 qubits), and hexagon (N = 6, 25 qubits) — with cross-chiral tunnels on every bond produces the same 9-entry ordered-pair lookup table at every bond, agreeing within 0.02–0.03 across topologies. The β → γ destructive zero is identically 0.000 on every bond of every topology. The architecture is therefore a Z₃-symmetric quantum cellular automaton with a derived local rule, not a gauge theory with loop-level invariants: within-phase-class variance exceeds between-phase-class variance on every observable tested, falsifying the Z₃ plaquette-holonomy interpretation. Register capacity scales with bond count E rather than vertex count N, giving native edge-level parallelism on the Eisenstein coordination lattice. A five-channel stress test (depolarising, amplitude damping, phase damping, combined amplitude + phase, and IBM Eagle r3 via FakeSherbrooke) across J ∈ [0, 1.0] and n ∈ [1, 10] establishes the hardware-viable operating point at n = 1, J ∈ [0.05, 0.13] or [0.2, 0.5]. At this point the predicted directional gap sits in [0.09, 0.30] with significance 6.4σ (FakeSherbrooke) to 37σ (uniform depolarising) at 6 repeats × 4,096 shots. Phase damping is nearly transparent to the signal — the (β, γ) tunnel zero persists at exactly 0.000 under pure T₂ dephasing — identifying the cross-chiral tunnel as a natural decoherence-free subspace for ordered-pair ternary information. Three pre-registered hardware observables operationalise the protocol on present-day processors. Observable 14 (2-merkabit tunnel, 9 qubits, ≤ 45 QPU-min) targets the directional gap with four sub-tests: 14a gap magnitude, 14b sign persistence, 14c information retention versus local observables, 14d phase-damping enhancement via dynamical decoupling. Observable 16 (triangle lookup table, 13 qubits, ~25 QPU-min) validates the 9-entry table on the Eisenstein-native minimum ring. Observable 17 (4-square parallel-bond pattern, 17 qubits, ~10 QPU-min) validates multi-bond locality on a 4-coordinated ring. Each observable carries explicit pass/fail thresholds anchored to public commit SHAs, and each names a specific structural primitive that is falsified if its threshold fails. Agreement across Observables 14 + 16 + 17 within 0.05 confirms the cellular-automaton interpretation. Position in the Merkabit Research Series. Papers 24–26 confirmed 5/5 pre-registered single-cell hardware predictions on IBM Eagle r3 and Heron r2, including the sub-Poissonian Fano signature F = 0.856 ± 0.030 at 131σ below Poisson. Paper 31 extends that pre-registration discipline from the single-cell pentachoric ouroboros to the multi-cell tunnel and its lattice-cellular-automaton composition. Paper 32 is a focused companion that extracts the universal 9-entry lookup table and topology-independence result as a standalone deposit. Paper 33 composes the primitive into a primitive-complete 19-qubit self-hosting quantum computer with a native Z₃ cyclic clock α → γ → β → α (Pentachoric Verification Protocol, Observable 22). Paper 34 extends the architecture to two coupled compute triangles on 28 qubits and reports the cyclotomic Z₃ ternary spectrum predicted by Paper 7's complementary Regime 2 framework. Code, raw simulation data, and timestamped pre-registration files are committed at https://github.com/SelinaAliens/tesseract_quantum_implementation. Hardware targets: IBM Eagle r3 / Heron r2 and Google Willow in cross-architecture parallel.
Paper 7 established that the 31 binary stratum of the PSL(2,7) decomposition — a single rotating triangle with three active gates {R, S, T}, no standing wave — has the truncated Dirichlet series Z(s) = Σ n⁻ˢ as its natural transfer operator and the non-trivial Riemann zeros as its spectrum. The complementary half of the architecture is the 137 ternary stratum (Z₆₂ + T₇₅): two full counter-rotating triangles each carrying the complete five-gate set {S, R, T, F, P}, coupled through a shared substrate. Paper 7 left the form of this ternary spectrum open. The present paper measures it and reports its structural form. The architecture. Two full Paper 33 compute triangles (12 qubits each) share a single 4-qubit database merkabit through cross-chiral memory tunnels u_C₁ → v_D and u_C₂ → v_D at J_mem = 0.5. The total footprint is 28 qubits; the v_D reduced density matrix is the spectral readout. Both triangles run at the same Coxeter period T_CYCLE = 12; the experimental degree of freedom is the relative phase offset offset_T2 ∈ {0, 1, …, 35}, sweeping three full Coxeter periods. The result: cyclotomic Z₃. A 28-qubit cirq.Simulator sweep over 324 configurations (36 phase offsets × 9 Z₃ × Z₃ input-label pairs) produces a mean v_D von Neumann entropy spectrum that is perfectly period-12 with a peak at offset = T_CYCLE / 3 = 4 (collapse event, ⟨S⟩ = 1.1669 — v_D maximally mixed) and a trough at offset = 2 T_CYCLE / 3 = 8 (locking event, ⟨S⟩ = 1.1135 — v_D most coherent). The peak-to-trough contrast Δ⟨S⟩ = 0.0534 sits ~25× above numerical noise. (All numbers from the complex128 Stage C deposit; the earlier complex64 deposit gave 0.0521, ~2.5 % suppressed by single-precision floating-point rounding.) The FFT power spectrum is bichromatic: the fundamental at period 12 (power 0.0966) and the second harmonic at period 6 (power 0.0672); every other Fourier component is three orders of magnitude below at ≈ 10⁻⁴. This is the FFT signature of the Z₃ character table imprinted on a 12-step Coxeter cycle — exactly two non-zero Fourier coefficients (the cyclotomic field's generator and its conjugate), all others forced to zero by Z₃ symmetry. Both the period-12 master clock and the cyclotomic Z₃ symmetry are forced by the framework's forcing chain ℤ[ω] → Z₃ → A₄ → P₂₄ → McKay → E₆, with zero free parameters. Observable 23 — Pentachoric-Lock Spectrum (28 qubits). Four pre-registered falsifiable thresholds operationalise the prediction: (a) FFT dominant period = T_CYCLE ± 1 % (measured: 12.00 exact) (b) Peak-trough offset separation Δ = T_CYCLE / 3 ± 1 step (measured: 4 ± 0) (c) Peak-trough entropy contrast ≥ 0.02 (measured: 0.0534) (d) Harmonic purity ≥ 90 % of total non-DC power concentrated in {T_CYCLE, T_CYCLE / 2} (measured: 98.94 %) All four pass at ideal simulation. Period-12 exactness is bit-identical at 20/24 testable b vs b+12 offset pairs and within one ulp (2.22 × 10⁻¹⁶, double-precision machine epsilon) at the remaining 4. Hardware-noise-calibrated execution on IBM Eagle r3 / Heron r2 and Google Willow is committed code; the sweep awaits scheduling. Observable 24 — Regime 3 forward test (incommensurate coupling). The same double-triangle architecture with Triangle 2's internal Coxeter period set to 13 (or equivalently J_intra_2 = J_intra_1 × √2) breaks rationality between the two triangles' frequencies. Paper 7 Regime 3 predicts that incommensurate coupling destroys cyclotomic structure and produces GUE-distributed collapse offsets — the ternary-scale analogue of Riemann-zero-like behaviour. The script extension build_double_triangle_circuit(..., T_CYCLE_2=13) is committed; the 64-offset sweep is forecast as the multi-stratum continuation of Paper 7. Substrate verification — the R-locking test. Paper 34's §5 result rests on h(E₆) = 12 being the architecture's master clock. That premise is independently verified at the single-merkabit scale by R_locking_test.py: of five candidate activation patterns over the gates {S, R, T, F, P}, only the original 5-fold cycling reproduces α⁻¹ = 137.036 to within 10⁻⁴. Every 4-fold variant breaks the Floquet return F = 0.69678 by factors of 6–14× and shifts α⁻¹ by 0.15–0.27 units from CODATA — a deviation falsified by the IBM Eagle r3 hardware confirmation of Paper 24 to > 10³ σ. The 12-step Coxeter period is therefore not a numerical choice; it is the unique value compatible with the measured fine structure constant. Paper 34's cyclotomic Z₃ entropy spectrum and the R-locking test are two phase-shifted projections of the same underlying Coxeter clock — the 5-fold and the 3-fold subgroups of h(E₆) = 12. Position in the Merkabit Research Series. Paper 7 located all 29 known Riemann zeros in the 31 binary architecture's truncated Dirichlet spectrum. Paper 34 measures the complementary 137 ternary architecture's spectrum and reports cyclotomic Z₃ structure as its natural form. Together they exhaust the PSL(2,7) = 31 + 62 + 75 = 168 decomposition: arithmetic spectrum on the binary half, cyclotomic spectrum on the ternary half. Paper 31 establishes the cross-chiral tunnel as the directional ternary write primitive; Paper 32 establishes the 4-square memory register; Paper 33 composes them into the 19-qubit Pentachoric Verification Protocol; Paper 34 extends the architecture to 28 qubits and reports the spectral signature of the ternary stratum. Hardware confirmation of the single-cell substrate (5/5 pre-registered observables on IBM Eagle r3 and Heron r2, sub-Poissonian Fano F = 0.856 ± 0.030 at 131 σ below Poisson) is in Papers 24–26.
The merkabit's sub-Poissonian error statistics are not a property of IBM's heavy-hex topology. They are a geometric effect that follows the P gate — two Z rotations with opposite signs — regardless of the hardware substrate. Three lines of evidence are presented. 1. Cross-architecture hardware validation. All five Appendix N predictions from the Base Paper are confirmed on IBM Eagle r3 (ibm_strasbourg, ibm_brussels) and IBM Heron r2 (ibm_kingston, 156 qubits, different coupling map). The full protocol was run on Strasbourg and Kingston; Brussels confirmed P5 independently. The P2 local minima at n = 13 (0.688 vs 0.709, ideal 0.696) and n = 27 (0.670 vs 0.694, ideal 0.683) show both architectures bracketing the ideal within 2%. The DTC paired/control ratio on Heron r2 (3.43–3.92×) matches or exceeds all Eagle r3 values (3.20–3.58×). P5 (DTC robustness) is confirmed in this paper's cross-architecture session, completing the Appendix N scorecard: five of five predictions retired on hardware within a single week (6–12 April 2026). 2. Corrected Willow interpretation. Paper 24's conclusion that the sub-Poissonian signal is "architecture-specific to heavy-hex" was premature. The Google Willow surface-code data (F = 2.42, super-Poissonian) lacked the P gate entirely; the comparison was paired-IBM vs unpaired-Google, not hex vs square. The signal is absent from circuits without the P-gate asymmetry, regardless of topology. 3. Square-grid topology simulation. A noisy Monte Carlo simulation comparing hexagonal and square grids under the pentachoric ouroboros cycle shows that at syndrome extraction depth τ ≥ 5, the square grid produces sub-Poissonian Fano factors — and at matched sizes, is more sub-Poissonian than hex at every error rate. The 4×4 square grid (16 nodes) achieves F = 0.285 at ε = 0.10, the tightest anti-bunching of any cell tested. Pre-registered prediction for Google Willow hardware (timestamped before any Google hardware access): Fano factor (2-qubit, τ = 5): F ≈ 0.3–0.7 DTC paired/control ratio: > 3× P1b sign flip: n = 6 → 8 P2 local minimum (n = 13): P ≈ 0.696 P2 quasi-period peak: n = 39 ± 2 Fano (4×4 square grid, τ = 5): F ≈ 0.29 Cirq implementations (P1b, P2, P5) compile to depth 2 on Google hardware via PhXZ gate merging. Total resource: ~200 circuits at 4,096 shots, less than one hour of QPU time. Appendix N scorecard (complete): P1 Berry phase — Confirmed (Paper 25) P2 Quasi-period — Confirmed (Paper 25) P3 Z₂ chirality symmetry — Confirmed (Paper 24) P4 Centre-node detection rate — Confirmed (Paper 24) P5 DTC robustness — Confirmed (this paper, 3 backends, 2 architectures) No error mitigation was applied to any hardware result. All results are from raw hardware counts. No prediction has been missed or revised after the fact. This is Paper 26 of the Merkabit research series.
We report the first experimental validation of the merkabit dual-spinor architecture across four circuit families on IBM ibm_strasbourg (Eagle r3, 127 qubits), executed 6–7 April 2026. The central discovery is that the merkabit's defining operation — the P gate, applying asymmetric phase to counter-rotating spinors — compiles to two native Rz gates with opposite signs: P(φ) = Rz(+φ) ⊗ Rz(−φ). On IBM Eagle r3, both Rz gates are virtual-Z frame changes requiring zero duration, zero error, and zero additional circuit depth. The P gate is native. Eight independent hardware results confirm the architecture, spanning 2 to 26 qubits: Ouroboros return fidelity ZP-ORF = 0.968, transpiler confirming U₀†U₀ = I at depth 1 π-lock standing wave ⟨ZZ⟩ = +0.44 vs +0.447 ideal (2% agreement, two independent runs) Parity witness ⟨XX⟩ = −0.450, consistent with |Φ⁻⟩-like entanglement at 90° Bloch separation Z₂ chirality symmetry mean error 0.016 across n = 4, 6, 8, 12 — all below readout noise threshold; non-monotonic ⟨ZZ⟩ breathing confirmed as standing-wave signature Two-scale Fano structure (9-qubit triangle): intra-round Fano F ≈ 0.52–0.54, within-τ dispersion σ ≤ 0.004 across 18 hardware rounds at τ ∈ {1, 5, 12} Inter-round coherence ρ ≈ 0.86 on the same triangle cell, confirming the two-scale standing-wave memory signature predicted by Paper 15 Full pentachoric error detection (26-qubit, 7-node Eisenstein cell): detection rate 0.089 (baseline) → 0.988 (injected), a 89.9 pp jump; 28/28 single-gate injections above 97% Centre-node syndrome weight 2× periphery matching Eisenstein lattice coordination; sub-Poissonian Fano on every injection (F_centre = 0.055 ± 0.009, F_periphery ≈ 0.20); Z₂ chirality symmetry confirmed inside the Fano structure Four of seven formal predictions from earlier papers in the series are retired by hardware data: P3 (Z₂ symmetry, mean error 0.016 vs <5% threshold), P4 (centre-node detection rate, 99.3% vs 91% ± 5% predicted, exceeding the upper tolerance by 3.3 pp), rotation-gap flatness, and two-scale Fano separation. Three predictions (P1 Berry phase, P2 quasi-period, P5 DTC robustness) remain pending for a subsequent session. A cross-platform reanalysis of Google Quantum AI's 420-experiment Willow dataset shows the opposite sign on every metric (F = 2.42 super-Poissonian, super-linear burst scaling, positive spatial correlation), consistent with a topology distinction: IBM heavy-hex maps naturally onto the Eisenstein lattice; Willow's square grid does not. No error mitigation, post-selection, or parameter tuning was applied to any primary result. Keywords: merkabit, dual spinor, P gate, quantum error correction, sub-Poissonian statistics, Eisenstein lattice, pentachoric code, IBM Eagle r3, Google Willow, standing wave, π-lock, Z₂ symmetry, Fano factor, Floquet time crystal
The merkabit is a balanced ternary computational unit based on dual spinors (u, v) ∈ S³ × S³ with counter-rotating phase evolution at π-lock. The Eisenstein lattice ℤ[ω], balanced ternary logic {−1, 0, +1}, and the gate set {Rₓ, Rz, P, F, C-SWAP} are derived — not assumed — from this definition. The governing algebra E₆ enters via the McKay correspondence from the binary tetrahedral group P₂₄ with zero free parameters; E₆ is uniquely isolated from its Langlands companions B₆ and C₆ by the McKay constraint and the self-duality condition h = h∨ = 12. Three algebraically independent routes yield α⁻¹ = 137: Route A (phase-space counting: 7 × 24 − 31), Route B (Casimir–Eisenstein: N(12 + 5ω) + dim(so(8)) = 109 + 28), and Route C (zero-point Berry phase: −ln F/10, where the return fidelity F is transcendental with two exact rational layers capturing 99.999966% of −ln F). A three-order correction from the E₆ Coxeter spectrum gives α⁻¹ = 137.035999083, matching experiment to 0.005 ppb. Error correction is intrinsic and geometric at three nested levels (π-lock, pentachoric complementarity, E₆ root syndromes), with composite suppression of 3,500–6,200× at ε = 10⁻³. The fault-tolerance threshold is ε ≈ 22%; the Peierls bound on the intrinsic torus gives ε_th ≈ 43 — both far above the surface code's ~1%. The ouroboros cycle (period 12) is a discrete time quasi-crystal with Z₂ topological order and Z₃ subharmonic character. The F gate reduces long-range coupling from O(d) to O(1). Appendices A–P (46 parameter-free simulations, Python 3 + NumPy only) verify every testable claim.