Lucy

single photons from a semiconductor quantum-dot micropillar source, demultiplexed into many modes; qubit count bounded by source brightness ÷ demux loss

path/time-bin-encoded single-photon qubits from one demultiplexed QD source; 12 qubits (delivered CEA TGCC Oct 2025)

dual-rail path encoding (Quandela also uses polarisation encodings)

post-selected/heralded linear-optical 2Q gates, not FBQC fusion; launched on Joliot-Curie HPC 14 Apr 2026; published fidelities exist only for Ascella

reconfigurable linear-optical interferometer mesh fed by the demultiplexed QD source

electro-optic control, room temperature; on-prem HPC-integrated at CEA TGCC (Joliot-Curie)

SNSPD single-photon detection

no QEC demonstrated; no code family named for the 50-logical-by-2028 roadmap milestone

no decoder published; compilers and decoders dedicated to error correction scheduled for 2027

alternate only: no fibre inter-module link published

no inter-module photonic link published; single module

GaAs quantum-dot single-photon source (III-V heterostructure)

SiN/silica interferometer meshes (photonic IC); foundry not stated

needs two L10 nodes: SiN/silica interferometer meshes (fab_pic) plus GaAs quantum-dot source (fab_mbe); the Atlas allows one