Environmental noise is a big obstacle in quantum communication and computation. Quantum error code (QEC) technology can resist the photon transmission loss and decoherence error caused by the environmental noise and has great application potential in future quantum communication and computation fields. The generation of logic qubits or logic entanglement is the important first step of the QEC. The logic W state, which replaces each physical qubit in a physical W state with a logic qubit, may be highly robust against photon loss and errors, so that it may have big application potential. In this paper, we propose an efficient scheme to generate an arbitrary logic W state with the help of cross-Kerr nonlinearities. Our protocol only requires a physical W state and some auxiliary single photons, and can deterministically generate a general logic W state based on the homodyne measurement results. Our logic W state generation protocol may be useful in future quantum information proces...

中文翻译：

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具有跨Keer非线性的任意逻辑W状态的生成

环境噪声是量子通信和计算中的一大障碍。量子误差码（QEC）技术可以抵抗环境噪声引起的光子传输损失和退相干误差，在未来的量子通信和计算领域具有巨大的应用潜力。逻辑量子位或逻辑纠缠的生成是QEC的重要第一步。用逻辑量子位代替物理W状态中的每个物理量子位的逻辑W状态可以对光子丢失和错误具有很高的鲁棒性，从而具有很大的应用潜力。在本文中，我们提出了一种有效的方案，可以借助跨Keer非线性来生成任意逻辑W状态。我们的协议仅要求物理W状态和一些辅助单光子，并且可以基于零差测量结果确定性地生成一般逻辑W状态。我们的逻辑W状态生成协议可能在将来的量子信息过程中很有用...