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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.
Intel plans to pair Classiq's circuit-synthesis software with its own spin-qubit manufacturing. The company does not yet sell a quantum computer. Its best-known chip, released to research labs in 2023, has 12 qubits.
A 70-million-transistor chip at 4 kelvin generated every control pulse for HRL's silicon spin qubits. The team used up to seven of its 18 physical qubits, on codes that correct one type of error or only detect errors.
Researchers reported in Nature Communications that eight physical qubits in a linear array kept their coherence. They demonstrated a two-qubit gate on one of four qubit pairs and reported no gate fidelities for the array.
Silicon spin qubits now come from 300 mm lines at imec, Intel, and STMicroelectronics. No maker has yet shown a fab supplying enriched silicon, qubits uniform enough to tune automatically at scale, or control electronics within a million-qubit power budget.
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.
