Summary
Q-CTRL has introduced Q-NEXUS, a heterogeneous quantum computing architecture that splits workloads across specialized modules: processing units, quantum memory, state factories, and a quantum bus. The design mirrors the classical von Neumann model and is paired with Q-CHESS, a compiler that coordinates timing, scheduling, and error budgets across modules running at different clock rates.
For RSA-2048, the team reports large resource cuts without changing the cryptanalytic algorithm. Using an experimentally demonstrated grid-coupling topology with Gidney’s 2025 algorithm, factoring would need about 381,000 physical qubits and 9.2 days. An application-specific Adder accelerator trades up to about 439,000 qubits for a 4.9-day runtime. If long-range qubit coupling enables qLDPC memory, the estimate drops to roughly 190,000 qubits in under 10 days, about a 4.7x reduction versus monolithic baselines.
Why it matters for security leaders: architecture choices can shift quantum attack feasibility as much as algorithms. These are still fault-tolerant projections that assume high fidelities and, in one case, hypothetical long-range coupling, so RSA-2048 is not in immediate danger. The direction is clear. Prioritize PQC migration, crypto agility, and asset inventories, and track heterogeneous designs and compiler toolchains as leading indicators of when quantum threats turn operational.
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See the original article at: https://postquantum.com/security-pqc/architecture-heterogenous-crqc-q-ctrl/