QCBRIEF
The Tel Aviv startup's modular 3D superconducting design uses an error correction scheme called topological code to store each useful logical qubit across a 2D patch of raw hardware qubits, then links distant patches through an auxiliary code strip
Qarakal Quantum, a Tel Aviv-based startup, published a modular 3D superconducting fault-tolerant quantum computing architecture called "Pangaea" on August 5. The design connects patches of 2D topological code through a "quantum bus," an auxiliary gauge-code strip whose measurements reconstruct joint logical operators across distant modules.
The company frames its key efficiency claim narrowly: at a 50-logical-qubit scale, Pangaea uses up to 10x fewer physical qubits than a planar surface-code architecture at matched logical error rates. The mechanism scales auxiliary qubit overhead from O(d²·N_L) to O(d·N_L), a function of code distance and logical qubit count.
The arXiv preprint is authored by Qarakal's Sheir Yarkoni, Chen Scheim, and Daniel Hakshuri, with Nadav Katz of the Racah Institute of Physics at Hebrew University of Jerusalem. Quantum Computing Report surfaced the announcement the same day.
The 10x figure is a vendor projection at a stated scale, not an independent benchmark. The arXiv paper is a preprint, not peer-reviewed, and the bus mechanism is described as "IP-protected," which limits independent protocol verification. The architecture is design-stage: no fabricated device demonstration accompanies the claim.