Carina

Raveh Neeman

doi:10.5281/zenodo.22674814

QuiX Quantum · photonics · ANNOUNCED (core hardware delivered to DLR QCI) (14 Jul 2026) · 8 physical qubits · access: on-prem sold; rack-based data-centre integration

architecture: Fusion-based photonic (FBQC) · Open on the map

Register profile — the machine's variant of its architecture

qubit type: single photons, dual-rail/path encoded; measurement-based computation

gate mechanism: MBQC on photonic cluster states; entangling by linear-optical fusion

connectivity: photonic cluster state over a silicon-nitride mesh; ~98.6% fidelity on arbitrary 12x12 unitaries

control: FFCU (Feed Forward Control Unit) + PACU (Photonic Assembly Control Unit) named as first-class subsystems; no latency number published

control placement: room-temp electro-optic

readout: SNSPD

gate evidence: no published figure

flags: source not confirmed, specification absent

Technologies by layer — the machine's cell per layer

1 Qubit carrier	Single photon (discrete variable) · primary ▨ 🔎 single photons, dual-rail/path encoded, measurement-based; Carina qubit count not stated (announced 14 Jul 2026; DLR contract 8 then 64 qubits)
2 Encoding	Dual-rail (erasure) encoding · primary ▨ 🔎 dual-rail/path-encoded photonic qubits for MBQC
3 Gate mechanism	Linear-optical fusion (heralded) · primary ▨ 🔎 MBQC on photonic cluster states, entangling by linear-optical fusion; 2026 first-gen (~8 q) universal gate set with high-speed feed-forward
4 Connectivity / transport	Photonic switching / routing (electro-optic, feed-forward) · primary ▨ ✅ cluster state over SiN mesh; 20-mode chip with 66 interferometric cells / 132 thermo-optic phase actuators; ~98.6% fidelity on 12×12 unitaries
5 Control	Electro-optic drive + feed-forward electronics (room temperature) · primary ▨ ✅ FFCU (Feed Forward Control Unit) + PACU (Photonic Assembly Control Unit) as named subsystems; no latency number published
6 Readout	Single-photon detection (SNSPD / TES) · primary ▨ 🔎 SNSPD (cryogenic detectors; rest of rack at room temperature)
7 Code	Fusion-based fault tolerance · primary ▨ ✅ planned: 'logical qubit encoding with photon-loss redundancy' from 2027; no code named — none — nothing in this layer ▨ ✅ no code named or run; QEC features planned for 2nd generation (2027)
8 Decoder	— none — nothing in this layer ▨ ✅ no decoder published
9 Interconnect	— none — nothing in this layer ◌ 🔎 no inter-module link published; single rack-based system
10 Manufacturing	Photonic IC foundry (SiN, BTO, TFLN, SNSPD on 300 mm) · primary ▨ ✅ QuiX's own low-loss silicon-nitride waveguide platform

evidence: ✅ 6 / 11