Entanglement First modules

Raveh Neeman

doi:10.5281/zenodo.22674814

Photonic Inc. · defect spins · DEMONSTRATED (component / link level) (13 Feb 2026) · qubits not published · access: cloud via Microsoft Azure

architecture: Colour-centre spins — network nodes (NV/SiV/T) · Open on the map

Register profile — the machine's variant of its architecture

qubit type: silicon T centre - a carbon-hydrogen complex in Si-28 with a native telecom-band optical transition

gate mechanism: microwave ESR + hyperfine-conditional nuclear gates locally; entanglement between modules by spin-photon emission and Bell measurement

connectivity: any-to-any by optical link - this is the whole architecture, and it is why Photonic chose a non-local code

control: baseband + microwave + optical

control placement: baseband + optical, 1 K

readout: cavity-enhanced spin-dependent optical readout

gate evidence: no published figure

codes: shyps

flags: no rate published, path membership gap

Technologies by layer — the machine's cell per layer

1 Qubit carrier	Colour-centre / defect spin (NV, SiV, SnV, T centre) · primary ▣ Fig. 2A (T centre in Si lattice inside photonic-chip cavity); Fig. 3A (level structure) ✅ silicon T centre (C-H complex in Si-28) with native telecom-band optical transition; one T centre = 4 spin qubits (3 nuclear + 1 electron)
2 Encoding	Single-spin (Loss–DiVincenzo) / nuclear-spin encoding · primary ▣ Fig. 3A (electron/hole/H spin fine structure); Fig. 4 (electron + nuclear spin transitions) ✅ bare electron and nuclear spin-1/2 of the T centre; no machine-specific encoding source
3 Gate mechanism	Microwave / optical spin gates (defect centres, 1Q spins) · primary ▣ Fig. 4B,D (MW/RF Rabi; π rotation = C_HNOT_e / C_eNOT_H); Fig. 8 (teleported CNOT) ✅ microwave ESR + hyperfine-conditional nuclear gates locally; inter-module entanglement by spin-photon emission and Bell measurement
4 Connectivity / transport	Static nearest-neighbour lattice · alternate ▦ 🔎 path-assigned cx_nn; the note calls it wrong in kind: connectivity is any-to-any by optical link — (Atlas gap: ∅G-optlink) · primary ▣ Fig. 1C (multi-module phase-3 computer); Fig. 2B (two modules linked by ~40 m fibre) ✅ any-to-any optical link used as the connectivity layer, not only as interconnect; basis for the non-local code choice (NN-only qubits limited to surface codes)
5 Control	Baseband electrical control (spins, Majorana) · primary ▣ Fig. 2A (on-chip MW/RF antenna, grating coupler); Fig. 2B (MW lines, optical modulators) ✅ baseband + microwave + optical control; operates at 1 K
6 Readout	Fluorescence state detection (ions, defects) · primary ▣ Fig. 3B-C (cavity Purcell enhancement); Fig. 4E + Fig. 12 (single-shot spin readout by photon counts) ✅ cavity-enhanced spin-dependent optical readout
7 Code	Non-local qLDPC codes (bivariate bicycle, 'gross') · primary ▦ ✅ SHYPS qLDPC code family, enabled by any-to-any optical connectivity (compiled, not run on hardware)
8 Decoder	— none — nothing in this layer ▦ 🔎 no decoder published; the defect architecture has an empty L8
9 Interconnect	Spin–photon solid-state link (SiV, NV, T centre) · primary ▨ ✅ teleportation of a state into a remote matter node over 30 km TELUS commercial fibre (13 Feb 2026); no rate or fidelity published
10 Manufacturing	— (Atlas gap: ∅G-sicolour) · primary ▤ §VI Supplementary Material (device: 200 nm SOI, isotopic purification, 4-step T-centre creation) ✅ Si-28 T-centre + silicon-photonics co-fabrication; no foundry node published; fab_diamond is diamond-only, fab_pic sits on ph_* paths

evidence: ✅ 9 / 11