• Abstract Magic state distillation enables universal fault-tolerant quantum computation by implementing non-Clifford gates via the preparation of high-fidelity magic states. • However, it comes at the cost of substantial logical-level overhead in both space and time. • In this work, we propose a very low-cost magic state distillation scheme for biased-noise qubits. • By leveraging the noise bias, our scheme enables the preparation of a magic state with a logical error rate of 3 × 10−7, using only 53 qubits and 5.5 error correction rounds, under a noise bias of η ≳ 5 × 106 and a phase-flip noise rate of 0.1%. • This reduces the circuit volume by more than one order of magnitude relative to magic state cultivation for unbiased-noise qubits and by more than two orders of magnitude relative to standard magic state distillation. • Moreover, our scheme provides three key advantages over previous proposals for biased-noise qubits.
Article Summaries:
- Researchers have introduced a highly efficient magic‑state distillation protocol tailored for qubits with biased noise. By exploiting a large phase‑flip bias (η ≳ 5 × 10⁶) and a 0.1 % phase‑flip rate, the scheme produces a magic state with a logical error rate of 3 × 10⁻⁷ using only 53 physical qubits and 5.5 error‑correction rounds. This approach cuts circuit volume by more than an order of magnitude compared with unbiased‑noise distillation and by over two orders relative to conventional methods. It requires only nearest‑neighbor two‑qubit gates on a 2‑D lattice, remains effective at modest bias levels (η ≳ 80), and tolerates high physical error rates without exponential growth in resource demands.
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