Single-photon amplification can be used to overcome the photon loss in long-distance quantum communication. However, the trade-off of success probability and amplification gain should be further improved. We propose a single-photon polarization qubit amplification using weak measurement. The polarization qubit can be amplified by the pre- and post-selection of the single-photon meter state weakly coupling with the input state. The success probability does not decrease asymptotically to 0 with increasing amplification gain in the presented proposal, and is higher than that in entanglement-based schemes, without coincidence detection required. Our proposal is feasible in current technology, and helpful for near-future quantum communication.

单光子放大可用于克服长距离量子通信中的光子损失。然而，成功概率和放大增益的权衡应该进一步改进。我们提出了一种使用弱测量的单光子偏振量子位放大。偏振量子位可以通过与输入状态弱耦合的单光子计状态的前后选择来放大。在所提出的提议中，成功概率不会随着放大增益的增加而逐渐降低到 0，并且高于基于纠缠的方案，不需要重合检测。我们的提议在当前技术中是可行的，并且有助于近期的量子通信。