通用纠缠蒸馏
Universal Entanglement Distillation
- QuSoft
- Korteweg–de Vries Institute for Mathematics, University of Amsterdam(阿姆斯特丹大学柯特维格-德弗里斯数学研究所)
- Institute for Quantum Information and Matter, California Institute of Technology(加州理工学院量子信息与物质研究所)
- NEST, Scuola Normale Superiore and Istituto Nanoscienze, Consiglio Nazionale delle Ricerche(意大利国家研究委员会纳米科学研究所与比萨高等师范学院NEST)
- Scuola Normale Superiore(比萨高等师范学院)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
提出一种通用纠缠蒸馏协议,通过层析成像与自适应蒸馏结合,在未知双态系统中渐近达到最优可蒸馏纠缠速率,证明状态未知不导致速率损失。
AI中文摘要:
我们提出了一种通用纠缠蒸馏协议,该协议在渐近意义上能够达到任意未知双态系统在固定有限维度下的可蒸馏纠缠量。也就是说,其纠缠比特产率能够达到在状态已知情况下可获得的最优速率以下的每一个速率,且迹距离误差趋于零。我们的方法将基于局域操作与经典通信的层析成像与自适应蒸馏程序相结合,并利用局部鲁棒性引理来控制有限样本估计误差。我们还刻画了从一族状态中进行最坏情况蒸馏的特性:最优均匀速率是该族闭包上的最小可蒸馏纠缠量。这些结果表明,对状态的无知并不必然导致渐近速率损失。
英文摘要:
We present a universal entanglement distillation protocol that asymptotically achieves the distillable entanglement of any unknown bipartite state in a fixed finite dimension. That is, its ebit yield attains every rate below the optimum that would be available if the state were known, with vanishing trace-distance error. Our approach combines tomography by local operations and classical communication with an adaptive distillation routine, using a local robustness lemma to control finite-sample estimation errors. We also characterize worst-case distillation from a family of states: the optimal uniform rate is the minimum distillable entanglement on the family's closure. These results show that ignorance of the state need not incur an asymptotic rate penalty.