Qubit Zoo

Fusion-based quantum computation

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Introduces fusion-based quantum computation (FBQC), a modular architecture for fault-tolerant photonic quantum computing where entanglement is generated by destructive “fusion” measurements on small resource states rather than by building large cluster states. Demonstrates that FBQC has significantly higher fault-tolerance thresholds than previous linear-optical approaches.

Key Results

  • Fusion threshold: ~1% total loss per fusion (including photon loss + detector inefficiency)
  • Resource states: small entangled photonic states (e.g., 6-ring or 4-star states)
  • Architecture is inherently modular: compatible with multiplexed photon sources and reconfigurable networks
  • Simulated logical error rates competitive with matter-based approaches

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