论文标题
尺寸约束量子设备的异质多部分纠缠净化
Heterogeneous Multipartite Entanglement Purification for Size-Constrained Quantum Devices
论文作者
论文摘要
量子信息处理所需的纠缠资源以各种形式出现,从钟形到多部分GHz状态或集群状态。净化这些资源在它们不完美的生成之后是在量子体系结构中使用它们的必不可少的一步。尽管在铃对和更一般的多部分纠缠状态的情况下,这一挑战大多在存在带有不受限制的量子寄存器大小的完美局部量子硬件的情况下被克服,因此为有限尺寸的逼真的噪声硬件设计了最佳的纯化策略,但仍然难以捉摸。在这里,我们偏离了过去二十年来探索的多部分状态的典型纯化范式。我们提出了考虑硬件限制的情况,并且出人意料地发现,像贝尔对这样的较小的“牺牲”状态在纯化多部分状态中比这些状态的其他副本更有用。这大大简化了要求,并提出了一种从根本上利用近期网络量子硬件的新途径。
The entanglement resource required for quantum information processing comes in a variety of forms, from Bell states to multipartite GHZ states or cluster states. Purifying these resources after their imperfect generation is an indispensable step towards using them in quantum architectures. While this challenge, both in the case of Bell pairs and more general multipartite entangled states, is mostly overcome in the presence of perfect local quantum hardware with unconstrained qubit register sizes, devising optimal purification strategies for finite-size realistic noisy hardware has remained elusive. Here we depart from the typical purification paradigm for multipartite states explored in the last twenty years. We present cases where the hardware limitations are taken into account, and surprisingly find that smaller `sacrificial' states, like Bell pairs, can be more useful in the purification of multipartite states than additional copies of these same states. This drastically simplifies the requirements and presents a fundamentally new pathway to leverage near term networked quantum hardware.