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I must confess: I’ve always had some hesitation about writing on these topics. They’re too radical, too fundamental. One risks being taken for crazy. But for a couple of years now, one question has been pressing on me more insistently each day: are we really sure that space and time are the very backdrop on which the universe is built? The answer is: it depends on the point of view.

In recent months, the community has made decisive progress toward fault tolerance: with the Willow chip, Google demonstrated surface code logical memories that reduce error exponentially as code distance increases (“below threshold”). Concretely: a distance-7 logical built from 101 physical qubits achieved 0.143% error per cycle and a lifetime beyond break-even...

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...

A critical building block of universal quantum computation is magic state distillation (MSD), required to implement high-fidelity non-Clifford gates. Teams from QuEra/Harvard/MIT have reported the first MSD carried out entirely at the logical level on neutral atoms, using color codes with distance-3 and distance-5: 5-to-1 distillation with fidelity improvement and parallelism on reconfigurable logical qubits. The shift from MSD on fragile physical qubits to MSD on...