论文标题
连续变量量子通信的三模式擦除代码
A Three-Mode Erasure Code for Continuous Variable Quantum Communications
论文作者
论文摘要
通过逼真的自由空间通道传输的量子状态通常由于多种因素（例如发射器和接收器之间的效率低下）而遭受擦除错误。在这项工作中，提出了能够保护单模量子状态免受擦除的错误校正代码。我们的三模式代码通过双分部分CV纠缠状态保护单模连续变量（CV）状态。在现实的部署中，它几乎可以完全逆转在编码状态上的单个擦除，对于两个擦除，它可以改善接收状态的忠诚度相对于直接传输。编码中使用的双方纠缠状态可以是高斯或非高斯，后者进一步增强了代码的性能。我们的新代码是已知的最简单的代码，该代码可保护单个模式免受擦除，并应证明在构建依赖自由空间光学器件的实用CV量子网络中很有用。
Quantum states of light being transmitted via realistic free-space channels often suffer erasure errors due to several factors such as coupling inefficiencies between transmitter and receiver. In this work, an error correction code capable of protecting a single-mode quantum state against erasures is presented. Our three-mode code protects a single-mode Continuous Variable (CV) state via a bipartite CV entangled state. In realistic deployments, it can almost completely reverse a single erasure on the encoded state, and for two erasures can it improve the fidelities of received states relative to direct transmission. The bipartite entangled state used in the encoding can be Gaussian or non-Gaussian, with the latter further enhancing the performance of the code. Our new code is the simplest code known that protects a single mode against erasures and should prove useful in the construction of practical CV quantum networks that rely on free-space optics.
