{"topic":{"slug":"photonic-topological-qubits","name":"Photonic, Spin & Topological Qubits","domain":"quantum-computing","description":"Photonic fusion-based architectures and GKP states, silicon spin qubits, and Majorana-based topological qubits including the evidence debate.","keywords":["photonic quantum computing","fusion-based","GKP","spin qubit","silicon quantum dot","topological qubit","Majorana zero mode","measurement-based"],"paper_count":248,"latest_published":"2026-10-29","url":"https://space-kitty.com/topics/photonic-topological-qubits","api_url":"https://space-kitty.com/api/v1/topics/photonic-topological-qubits"},"dossier":{"slug":"photonic-topological-qubits","topic":"photonic-topological-qubits","title":"Photonic, Spin & Topological Qubits: State of the Field (October 2026)","summary":"An expert briefing, current to late October 2026, on three qubit families outside the superconducting and trapped-atom mainstream: photonic qubits built from fusion-based and continuous-variable/GKP architectures, semiconductor spin qubits in silicon and germanium, and Majorana-based topological qubits. Silicon-photonic platforms report component fidelities above 99% when photon detection is conditioned on, and the platform's authors identify optical loss as the main remaining gap. Silicon spin qubits have reached about 99% single-qubit control fidelity in research devices, and 2026 work centres on control electronics and shuttling. Majorana tetron preprints report parity lifetimes from microseconds to about 20 seconds, but whether these devices host topological zero modes remains contested.","version":1,"published_at":"2026-10-30","updated_at":"2026-10-30","stats":{"words":4876,"citations":42,"claims":26,"timeline":16,"benchmarks":21,"open_problems":7,"key_papers":15,"glossary":18},"verification":{"status":"verified","method":"independent AI fact-check against cited sources (evidence pack + web checks); automated citation resolution","claims_checked":26,"issues_fixed":28,"verified_at":"2026-10-30"},"ai_assisted":true,"price":{"usd":"0.20","protocol":"x402","network":"eip155:84532","asset":"USDC"},"url":"https://space-kitty.com/dossiers/photonic-topological-qubits","preview_url":"https://space-kitty.com/api/v1/dossiers/photonic-topological-qubits/preview","purchase_url":"https://space-kitty.com/api/v1/dossiers/photonic-topological-qubits"},"top_papers":[{"id":"arxiv:1212.3146","kind":"article","title":"Photonic Floquet topological insulators","authors":["Mikael C. 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