SymbiQ Desk notes https://symbiq.dev/signals Dated notes on one quantum or AI story at a time, from primary sources, with the evidence tier and what it does not mean. en Tue, 08 Sep 2026 00:00:00 +0000 Xanadu put a date on 1,000 logical qubits — and published the number it has to fix firsthttps://symbiq.dev/signals#xanadu-1000-logical-qubits-2031signals:xanadu-1000-logical-qubits-2031Tue, 08 Sep 2026 00:00:00 +0000More than 1,000 logical qubits by 2031, fault tolerance in 2028–2029, a quantum data centre by 2030. Also: a photon-loss figure that has to fall from 24.1× to 1.0×. The second number is the honest one. The building for Denmark’s quantum computer is finished. The computer is not.https://symbiq.dev/signals#qunorth-magne-facility-milestonesignals:qunorth-magne-facility-milestoneTue, 08 Sep 2026 00:00:00 +0000MAGNE’s Copenhagen facility cleared handover on 2 September; installation is only now beginning and full operation is expected in spring 2027. That makes a 2025 delivery promise measurable — and we just measured it. IBM and Chicago ran a hard, encoded circuit, and certified how good the answer washttps://symbiq.dev/signals#ibm-uchicago-70-logical-qubits-verifiedsignals:ibm-uchicago-70-logical-qubits-verifiedTue, 08 Sep 2026 00:00:00 +0000A 64-qubit circuit with 314 T gates, encoded in 76 physical qubits, with gate errors about ten times lower once runs that flagged an error were thrown out. The new part is not the size. It is the certificate. Fujitsu has a diamond-spin quantum computer working — and has not said how big it ishttps://symbiq.dev/signals#fujitsu-diamond-spin-prototypesignals:fujitsu-diamond-spin-prototypeTue, 08 Sep 2026 00:00:00 +0000Tin-vacancy centres built into photonic integrated circuits, running at −271.6 °C. The temperature is the interesting number. The missing qubit count is the interesting silence. A “quantum-safe” satellite link went live over Doha — and the word is doing two different jobshttps://symbiq.dev/signals#arqit-eshailsat-quantum-safe-satellitesignals:arqit-eshailsat-quantum-safe-satelliteTue, 08 Sep 2026 00:00:00 +0000Arqit, Es’hailSat and AIEE ran quantum-safe key agreement across an operating satellite link with no hardware swap. Worth being precise about what was, and was not, quantum about it.