Quantum repeaters based on concatenated bosonic and discrete-variable quantum codes
Quantum repeaters based on concatenated bosonic and discrete-variable quantum codes
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DOI：
10.1038/s41534-021-00438-7
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发表时间：
2020-11
影响因子：
7.6
通讯作者：
F. Rozpędek;Kyungjoo Noh;Qiang-Da Xu;S. Guha;Liang Jiang
中科院分区：
文献类型：
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作者：
F. Rozpędek;Kyungjoo Noh;Qiang-Da Xu;S. Guha;Liang Jiang
我们提出了一种基于量子纠错的量子中继器架构，该架构结合了离散变量和连续变量量子信息中使用的技术。具体而言，我们建议将传输的量子比特编码为由两个级别组成的串联代码。在第一层，我们使用连续变量GKP编码在单玻色子模式下编码量子位。在第二层，我们使用一个小的离散变量代码。这样的架构有两个重要的特性。首先，在两种不同类型的中继器中对每一级的误差进行校正。这使得在实现所有中继器都相同的架构时，能够以更低的成本实现实际场景所需的性能。其次，在较低级别上使用连续变量GKP码会产生额外的模拟信息，从而增强了第二级码的纠错能力，从而可以使用仅由四种或七种光模组成的编码进行长距离通信。
We propose an architecture of quantum-error-correction-based quantum repeaters that combines techniques used in discrete- and continuous-variable quantum information. Specifically, we propose to encode the transmitted qubits in a concatenated code consisting of two levels. On the first level we use a continuous-variable GKP code encoding the qubit in a single bosonic mode. On the second level we use a small discrete-variable code. Such an architecture has two important features. Firstly, errors on each of the two levels are corrected in repeaters of two different types. This enables for achieving performance needed in practical scenarios with a reduced cost with respect to an architecture for which all repeaters are the same. Secondly, the use of continuous-variable GKP code on the lower level generates additional analog information which enhances the error-correcting capabilities of the second-level code such that long-distance communication becomes possible with encodings consisting of only four or seven optical modes.