Protocol pre-registration — Lontano Terremoto: response of the PASM phase-imprint observable to the lunisolar harmonic tidal field (M2/S2) on a superconducting quantum processor
Alessandro Tulli
Abstract
Public pre-registration (N47Lab method: criteria written BEFORE the data, not negotiable afterwards) of a search for a response of the PASM (Phase-Anchored State Multiplexing) phase-imprint observable to the lunisolar harmonic tidal field on a superconducting quantum processor. Hypothesis: if the phase imprint is a property of the substrate sensitive to external gravitational stimuli, the PASM mutual information must modulate coherently with the harmonic tidal potential (constituents M2, S2, N2, K1, O1, Mf, Mm). If the imprint is insensitive to the environment, the MI spectrum is flat at tidal frequencies. No intermediate result modifies this hypothesis. Foundation (ANALOGICAL motivation, not proof): atomic clocks respond to the lunisolar tidal field (Qin & Cheng, Astron. J. 158, 262 (2019), DOI 10.3847/1538-3881/abc06f): the tidal field is a real, modeled, measurable signal on precision quantum systems. The direct channel (qubit frequency) is ~11 orders of magnitude below device noise: the analogy does NOT extend to that channel. The tested channel is the temporal statistical modulation of the PASM observable (shared MI), never evaluated in the literature (verification 31/08/2026): neither tested, nor discarded, nor considered - documentary silence, not a verdict. Method: session >= 30 days, one point every 30-60 minutes with rotated schedules (decorrelation from the solar day), fixed backend (ibm_marrakesh), 2 replicates per point, MI with timestamp, theoretical tidal reference from ephemerides (no ocean tides). Analysis: Lomb-Scargle periodogram on MI(t), significance vs null (permutations + FDR). Decision criteria (written first, not negotiable after data): C1 Presence: spectral power at M2 frequency significant vs null; C2 Discrimination: M2 and S2 resolved as distinct lines; C3 Ratio: M2/S2 power compatible with 2.17 within +/-50%; C4 Negative control: lines at NON-tidal frequencies must be absent (if present -> instrumental artifact, outcome NOT VALID). Pre-registered decision: >= 2 of 3 criteria (C1-C3) + clean C4 -> TIDAL RESPONSE; otherwise -> NOT DETECTED (environmental negative control, useful and publishable result). The test has value in both outcomes. Declared limits: hunt, not guarantee; 'NOT DETECTED' = non-detection at the given sensitivity (power, not absence); thermal drift and daily calibrations monitored and decorrelated. Context note (NOT a criterion): optional post-data coherence check - cross-correlation of MI(t) with public atomic-clock phase series (common M2 harmonic). It does NOT enter the pre-registered decision: criteria C1-C4 are the only ones. No modification to the criteria after session start, except formal ex-ante amendment. Related: MatterMemory PASM data V2 (DOI 10.5281/zenodo.22134568), pasm-experiments (DOI 10.5281/zenodo.21830151), research-timeline (DOI 10.5281/zenodo.21855315).