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On one cross-platform benchmark, Google's Willow ran about 66,000 times as many operations per second as Quantinuum's Helios-1, and Helios-1 ran circuits about seven times as large. Each vendor headlines the axis it leads on.
Rival quantum platforms draw on a short list of shared inputs, from helium-3 and precision lasers to foundry time and enriched silicon. U.S. and EU export rules now cover several of those inputs directly.
Quantinuum has reported logical-qubit counts of 94, 50, 48, and one on the same machine with 98 physical qubits, from four different experiments. With five questions, a reader can tell what most such announcements demonstrated.
Riverlane, NVIDIA, and several control-electronics makers now sell parts of the loop that turns error checks into corrections. Among the superconducting tests surveyed, loops using Riverlane's decoder have met a 10-microsecond budget, in small configurations only.
The code Infleqtion used is guaranteed to flag any single error but not to correct one, apart from the loss of an atom. A full paper with methods, resource counts, and statistics is still to come.
Stuttgart physicists shielded single strontium atoms from thermal microwaves with coated glass plates and measured one state's room-temperature lifetime at about 21 times its free-space value. Qubit coherence in their setup remains at the 100-microsecond scale, they wrote.
One block of Infleqtion's code stores 18 logical qubits in 98 physical data qubits. Infleqtion's Victory Omole wrote that those numbers are "not a hardware resource estimate." The company has not run the code on hardware.
QuEra sells neutral-atom machines with 256 and 260 physical qubits, while Harvard and MIT teams that include its co-founders have run arrays of more than 3,000 atoms. Its Libra computer, due in 2028, is the test.
QuEra said Libra will be available on Amazon Braket starting in 2028 and called the machine's specifications projected. Neither QuEra's release nor AWS's blog post gave the number of physical qubits the neutral-atom machine will use.
The team measured fewer logical errors in the larger of two codes, built from 64 physical qubits, over up to eight rounds. Over longer runs, the authors concluded only that logical error rates did not grow with code distance.
