Qubit Zoo

Linear optical quantum computing with photonic qubits

1 min read

Definitive review of linear-optical quantum computing, covering dual-rail photonic encoding, the KLM scheme, cluster-state improvements, and the experimental realities of sources, detectors, and interference visibility. It is the cleanest umbrella review for why dual-rail photonic qubits are powerful in principle but dominated in practice by loss and probabilistic entangling operations.

Key Results

  • Synthesizes the dual-rail encoding, KLM gates, and later measurement-based / cluster-state refinements
  • Explains how beam splitters and phase shifters provide universal one-qubit control in the one-photon subspace
  • Reviews the resource and loss constraints that dominate scalable photonic architectures
  • Connects abstract LOQC theory to realistic sources, detectors, and integrated photonic hardware

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