Anthropic uses Claude to design more efficient quantum circuits

Anthropic says Claude Mythos 5 designed quantum circuits largely autonomously in an automated evaluation loop, outperforming the best published approaches on eight computational primitives spanning chemistry, optimization, quantum simulation, and number theory, with some improvements reaching an order of magnitude. The researchers gave only a natural-language description, and an evaluation program verified circuit correctness and scored circuits by qubit count multiplied by gate count; Claude iterated on that basis without human intervention. On the elliptic-curve point-addition task, after a 53-hour run Claude produced what Anthropic calls the first reversible divsteps implementation that does not store branch information, and one of its designs used 12% more qubits than the previous smallest design but reduced gate count by 17 times. It also cut the gate count of the most expensive Reed–Solomon decoder in DQI to 1/12 of Google's earlier construction. The authors also note that Claude was initially conservative and favored existing methods, and the team mitigated this by requiring parallel proposals of multiple approaches and occasionally prompting it to broaden its search.