论文标题
使用非重生的高纯度纠缠热传播模式
High-Purity Entanglement of Hot Propagating Modes Using Nonreciprocity
论文作者
论文摘要
分布式量子信息处理和通信协议要求能够在传播模式之间产生纠缠。但是，热波动可以严重限制传播纠缠状态的保真度和纯度，尤其是对于与射频（RF）信号相关的低频模式。在这里，我们提出了非交流性，作为一种资源，以使传播模式与热波动的稳定模式进行连续变化。通过使用冷工程储层，我们在低频和高频模式之间打破了标准的两模式挤压相互作用中互惠的对称性，并表明热波动的重新波动可以使飞行的纠缠状态具有高纯度。我们的方法仅需要成对的高斯相互作用，因此对于参数电路QED实现是理想的选择。
Distributed quantum information processing and communication protocols demand the ability to generate entanglement among propagating modes. However, thermal fluctuations can severely limit the fidelity and purity of propagating entangled states, especially for low-frequency modes relevant for radio-frequency (RF) signals. Here we propose nonreciprocity as a resource to render continuous-variable entanglement of propagating modes robust against thermal fluctuations. By utilising a cold-engineered reservoir we break the symmetry of reciprocity in a standard two-mode squeezing interaction between a low- and a high-frequency mode, and show that the rerouting of thermal fluctuations allows the generation of flying entangled states with high purity. Our approach requires only pairwise Gaussian interactions and is thus ideal for parametric circuit QED implementations.
