论文标题
使用连贯状态叠加的无噪声线性扩增和耐损失的量子继电器
Noiseless Linear Amplification and Loss-Tolerant Quantum Relay using Coherent State Superpositions
论文作者
论文摘要
无噪声线性扩增（NLA）对于多种量子协议很有用。在这里，我们提出了一个完全可扩展的放大器，对于渐近尺寸，可以在任何量子状态下执行完美的保真度NLA。但是，鉴于有限的资源，它旨在对连贯的状态及其任意叠加执行完美的保真度NLA。我们的方案是对多光子量子剪刀远程放大器的概括，我们使用连贯的状态叠加资源状态实现。此外，我们证明我们的NLA也是多AR型相移键合状态的耐损耗的继电器。最后，我们证明我们的NLA对于连续变化的纠缠蒸馏也很有用，即使有现实的实验缺陷。
Noiseless linear amplification (NLA) is useful for a wide variety of quantum protocols. Here we propose a fully scalable amplifier which, for asymptotically large sizes, can perform perfect fidelity NLA on any quantum state. Given finite resources however, it is designed to perform perfect fidelity NLA on coherent states and their arbitrary superpositions. Our scheme is a generalisation of the multi-photon quantum scissor teleamplifier, which we implement using a coherent state superposition resource state. Furthermore, we prove our NLA is also a loss-tolerant relay for multi-ary phase-shift keyed coherent states. Finally, we demonstrate that our NLA is also useful for continuous-variable entanglement distillation, even with realistic experimental imperfections.
