On the photonics front, PsiQuantum and industrial partners have published in Nature the first integrated, “manufacturable” platform for photonic quantum computing on 300 mm silicon photonics (GlobalFoundries lines). They demonstrated key building blocks: SPAM 99,98%, HOM interference 99.50%, two-qubit fusion 99.22%, and chip-to-chip interconnection 99.72% (conditional on detection). This marks a leap in system engineering: sources, circuits, and SNSPDs integrated on the same stack, plus C-band fiber networks for module interconnection. Nature
At the ecosystem level, in 2024–25 we saw public-private partnerships emerge for two “utility-scale” sites (Brisbane and Chicago), alongside collaborations on cryogenic and process infrastructure. This signals that large-scale manufacturing (and therefore economies of scale) is becoming part of the strategy—not just qubit physics. For the European and Italian photonics supply chain (silicon photonics, detectors, packaging), this opens opportunities in components, testing, cryogenic packaging, and quantum networking. PsiQuantumReutersoptica-opn.org
Why it matters: the photonic approach promises inherently low noise, native fiber networking and manufacturing scalability. If the wafer-demonstrated building blocks converge with reduced losses and fast switching, photonics could accelerate the arrival of large-scale logical quantum computers. Nature
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