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Jun 3, 2025 · Reading time: ~45 sec.
Summary created with AI assistance · Source: scientificamerican.com
  • Microsoft announced a topological quantum computer in February 2025, but a Nature peer-review note said the study had not definitively demonstrated Majorana zero modes.

  • Google unveiled its 105-qubit Willow chip in December 2024, after which Mark Zuckerberg voiced doubts and quantum-computing stocks fell.

  • Amazon announced the nine-qubit Ocelot chip at the end of February 2025, using a superconducting resonator and photon-controlled, error-tolerant cat qubits.

  • No clear winner has emerged among the competing technical approaches, and scaling them to about one million qubits remains uncertain.
  • The Majorana 1 processor offers a clear path to fit a million qubits on a single chip that can fit in the palm of one’s hand.
    — Microsoft (from a press release about the Majorana-1 processor)
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