使用相干态叠加的无噪声线性放大与容损量子中继
Noiseless Linear Amplification and Loss-Tolerant Quantum Relay using Coherent State Superpositions
AI总结：
提出一种基于相干态叠加的多光子量子剪刀遥放大器推广方案，实现完美保真度的无噪声线性放大，并证明其可作为多进制相移键控相干态的容损量子中继及用于连续变量纠缠提纯。
摘要：
无噪声线性放大（NLA）对多种量子协议非常有用。在此，我们提出一种完全可扩展的放大器，对于渐近大的尺寸，它可以对任何量子态执行完美保真度的NLA。然而在有限资源下，它被设计为对相干态及其任意叠加态执行完美保真度的NLA。我们的方案是多光子量子剪刀遥放大器的推广，我们使用相干态叠加资源态来实现它。此外，我们证明我们的NLA也是多元相移键控相干态的容损中继。最后，我们证明即使存在实际的实验缺陷，我们的NLA也可用于连续变量纠缠蒸馏。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
