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首页> 外文期刊>Nature photonics >Quantum optical coherence can survive photon losses using a continuous-variable quantum erasure-correcting code
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Quantum optical coherence can survive photon losses using a continuous-variable quantum erasure-correcting code

机译：使用连续变量量子擦除校正码，量子光学相干可以克服光子损失

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摘要

A fundamental requirement for enabling fault-tolerant quantum information processing is an efficient quantum error-correcting code that robustly protects the involved fragile quantum states from their environment~(1-10). Just as classical error-correcting codes are indispensible in today's information technologies, it is believed that quantum error-correcting code will play a similarly crucial role in tomorrow's quantum information systems. Here, we report on the experimental demonstration of a quantum erasure-correcting code that overcomes the devastating effect of photon losses. Our quantum code is based on linear optics, and it protects a four-mode entangled mesoscopic state of light against erasures. We investigate two approaches for circumventing in-line losses, and demonstrate that both approaches exhibit transmission fidelities beyond what is possible by classical means. Because in-line attenuation is generally the strongest limitation to quantum communication, such an erasure-correcting code provides a new tool for establishing quantum optical coherence over longer distances.
机译：启用容错量子信息处理的基本要求是有效的量子纠错代码，该代码可强有力地保护所涉及的易碎量子状态不受其环境的影响（1-10）。就像当今的信息技术中不可缺少的经典纠错码一样，人们相信量子纠错码将在未来的量子信息系统中扮演同样重要的角色。在这里，我们报告了克服了光子损失的毁灭性影响的量子擦除校正代码的实验演示。我们的量子代码基于线性光学，可保护四模态纠缠的介观光态免遭擦除。我们研究了两种避免线损的方法，并证明了这两种方法都显示出传输保真度，这超出了传统方式的可能。因为在线衰减通常是对量子通信的最强限制，所以这种纠删码为在更长距离上建立量子光学相干性提供了一种新工具。

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