To realize the Quantum Internet, quantum communications require pre-shared entanglement among quantum nodes. However, both the generation and the distribution of the maximally-entangled quantum states are inherently contaminated by quantum decoherence. Conventionally, the quantum decoherence is mitigated by performing the consecutive steps of quantum entanglement distillation followed by quantum teleportation. However, this conventional approach imposes a long delay. To circumvent this impediment, we propose a novel quantum communication scheme relying on realistic noisy pre-shared entanglement, which eliminates the sequential steps imposing delay in the standard approach. More precisely, our proposed scheme can be viewed as a direct quantum communication scheme capable of improving the quantum bit error ratio (QBER) of the logical qubits despite relying on realistic noisy pre-shared entanglement. Our performance analysis shows that the proposed scheme offers competitive QBER, yield, and goodput compared to the existing state-of-the-art quantum communication schemes, despite requiring fewer quantum gates.
翻译:为了实现量子互联网,量子通信要求量子节点之间预先共享纠缠。然而,最大缠在一起的量子国家的生成和分布都必然受到量子脱节的污染。 常规上,量子脱节是通过连续进行量子缠绕蒸馏的步骤,然后进行量子传送转移来减缓的。然而,这一常规方法造成了长期的拖延。为避免这一障碍,我们提议了一个新型量子通信计划,依靠现实的、吵闹的预先共享的纠缠,从而消除在标准方法中造成拖延的顺序步骤。 更确切地说,我们提议的计划可以被视为直接量子通信计划,能够改进逻辑方位的量子的量子误差率(QBER ) 。 我们的绩效分析表明,拟议计划提供了有竞争力的量子连接、产量和好量子通信计划,尽管需要的量子门较少。