Macromux: scalable postselection for high-threshold fault-tolerant quantum computation
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910041766887424 |
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| author | Birchall, Patrick Bridgeman, Jacob Dawson, Christopher Farrelly, Terry Liu, Yehua Nickerson, Naomi Pant, Mihir Roberts, Sam Seetharam, Karthik Tuckett, David |
| author_facet | Birchall, Patrick Bridgeman, Jacob Dawson, Christopher Farrelly, Terry Liu, Yehua Nickerson, Naomi Pant, Mihir Roberts, Sam Seetharam, Karthik Tuckett, David |
| contents | We introduce a new resource-efficient scheme for fault-tolerant quantum computation known as `macroscale multiplexing' (or simply `Macromux'), that utilizes scalable postselection to significantly improve the threshold of a given fault-tolerant protocol against both Pauli and erasure errors. Macromux is a hierarchical method for postselecting on constant-size space-time windows of a fault tolerant protocol, requiring only constant additional overheads. The method can be straightforwardly implemented for any fault-tolerant protocol and in any architecture that has access to routing and memory, such as linear-optical fusion-based architectures. We construct fault-tolerant protocols that, to our knowledge, have the highest thresholds in the literature; we perform simulations of fusion-based schemes based on the surface code, showing a maximum possible increase in Pauli thresholds of up to a factor of $\sim6$ (from $1.0\%$ to $5.9\%$). Our schemes are highly-resource efficient, and can for example, double the loss thresholds of some photonic fusion-based protocols using as little as $3 \times$ overhead. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_04875 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Macromux: scalable postselection for high-threshold fault-tolerant quantum computation Birchall, Patrick Bridgeman, Jacob Dawson, Christopher Farrelly, Terry Liu, Yehua Nickerson, Naomi Pant, Mihir Roberts, Sam Seetharam, Karthik Tuckett, David Quantum Physics We introduce a new resource-efficient scheme for fault-tolerant quantum computation known as `macroscale multiplexing' (or simply `Macromux'), that utilizes scalable postselection to significantly improve the threshold of a given fault-tolerant protocol against both Pauli and erasure errors. Macromux is a hierarchical method for postselecting on constant-size space-time windows of a fault tolerant protocol, requiring only constant additional overheads. The method can be straightforwardly implemented for any fault-tolerant protocol and in any architecture that has access to routing and memory, such as linear-optical fusion-based architectures. We construct fault-tolerant protocols that, to our knowledge, have the highest thresholds in the literature; we perform simulations of fusion-based schemes based on the surface code, showing a maximum possible increase in Pauli thresholds of up to a factor of $\sim6$ (from $1.0\%$ to $5.9\%$). Our schemes are highly-resource efficient, and can for example, double the loss thresholds of some photonic fusion-based protocols using as little as $3 \times$ overhead. |
| title | Macromux: scalable postselection for high-threshold fault-tolerant quantum computation |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.04875 |