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IBM listed five spending areas, from research to acquisitions, without assigning amounts. Commerce had signed a letter of intent for $1 billion in planned CHIPS funding toward Anderon, IBM's planned quantum wafer foundry.
CAS Cold Atom Technology disclosed single- and two-qubit gate fidelities of 99.9% and 99% for Hanyuan-2. Chinese newspapers that reported the launch did not say whether atoms in its two arrays can be entangled with each other.
Researchers have fit Shor's algorithm into 9,739 neutral-atom physical qubits, with elliptic-curve runs that lengthen from 10 days to about 1,000 as the count falls. The authors assumed error rates and clock speeds no machine has shown together.
Shenzhen researchers reported logical operations on two logical qubits stored in phosphorus atoms. SQC described a processor with 11 physical qubits. QuTech, RIKEN, Intel, Diraq, and imec published results from quantum dots made in labs and in industrial fabs.
A Shenzhen team encoded two logical qubits in four phosphorus nuclear spins with an error-detecting code. Its logical gates averaged about 86% fidelity, below the more than 95% its physical gates averaged.
In PNAS, Oxford's Tim Palmer proposed that quantum computers lose their advantage above about 1,000 perfect qubits. He wrote that his theory and standard quantum mechanics agree on small systems. No experiment has yet tested where they differ.
Thirteen IBM researchers laid out how quantum processors should share schedulers, networks, and security controls with CPUs and GPUs. They described early installations at RIKEN and RPI. Tighter coupling and fully co-designed systems remain proposals.
