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Linear-optical quantum computation with arbitrary error-correcting codes
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High-rate quantum error correcting codes mitigate the imposing scale of fault-tolerant quantum computers but require efficient generation of non-local, many-body entanglement. We provide a linear-optical architecture with these properties, compatible with arbitrary codes and Gottesman-Kitaev-Preskill qubits on generic lattices, and featuring a natural way to leverage physical noise bias. Simulations of hyperbolic surface codes and bivariate bicycle codes, promising families of quantum low-density parity-check codes, reveal a threshold comparable to the 2D surface code with substantially better encoding rates.
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Resource-efficient high-threshold fault-tolerant quantum computation with weak nonlinear optics
A hybrid GKP-photon cluster-state architecture with weak cross-Kerr gates achieves a 7.4 dB squeezing threshold at 1% photon loss and 3.8 dB under negligible loss.
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