超越光谱强耦合：腔-磁振子量子转移的运行基准

中文摘要 AI 辅助

正常模式劈裂揭示了相干的腔-磁振子杂化，但并不能证明有限时间量子态转移的实现。我们将被动线性腔-磁振子系统与热库耦合时的量子转移描述为一个热损耗信道，该信道由其相干透射率$\eta$和输出参考热粒子数$\nu$来刻画。对于单轨量子比特，我们计算了相位校正后的平均保真度，并将其与确定性的测量-制备基准$2/3$进行比较。腔与孤立参考共享的贝尔对保留参考-磁振子纠缠当且仅当$\eta>\nu$。强度为$r$的输入压缩真空产生亚真空磁振子涨落当且仅当$\nu<\eta(1-e^{-2r})/2$。当初始磁振子与两个热库具有相同占据数时，解析确定的峰值透射率时间可优化所有三项任务。这些依赖于任务的基准表明，传统的基于线宽的强耦合判据并不能保证量子转移性能。相反，当附加噪声足够低时，纠缠或压缩可以在该光谱参考之下存活。这些基准为腔内到磁振子量子接口中的转移时序和热噪声控制提供了定量目标。

英文摘要

Normal-mode splitting reveals coherent cavity--magnon hybridization but does not certify finite-time quantum-state transfer. We describe quantum transfer in a passive, linear cavity--magnon system coupled to thermal reservoirs as a thermal-loss channel specified by its coherent transmissivity $η$ and output-referred thermal population $ν$. For single-rail qubits, we calculate the phase-corrected average fidelity and compare it with the deterministic measure-and-prepare benchmark of $2/3$. A Bell pair shared by the cavity and an isolated reference retains reference--magnon entanglement if and only if $η>ν$. An input squeezed vacuum of strength $r$ yields sub-vacuum magnon fluctuations if and only if $ν<η(1-e^{-2r})/2$. When the initial magnon and both reservoirs have the same occupation, an analytically determined peak-transmissivity time optimizes all three tasks. These task-dependent benchmarks show that a conventional linewidth-based strong-coupling criterion does not guarantee quantum-transfer performance. Conversely, entanglement or squeezing can survive below that spectroscopic reference when the added noise is sufficiently low. These benchmarks provide quantitative targets for transfer timing and thermal-noise control in intracavity-to-magnon quantum interfaces.

发表机构

• Southwest University（西南大学）

机构由 AI 辅助整理，请以论文原文为准。