论文标题
观察冷原子梯度回波记忆中跨相调制
Observation of cross phase modulation in cold atom gradient echo memory
论文作者
论文摘要
单个光子之间的强非线性相互作用在光学量子信息处理中具有重要的应用。冷原子集合中这些相互作用的演示很大程度上仅限于利用使用电磁诱导的透明度（EIT）产生的慢光。但是，由于自发排放，这些EIT实施的实现有限。在这里，我们使用梯度回声存储器，推断出单个光子相移为$ 0.07 \ pm0.02 $ $ $ $ $ $ $ \ text {rad} $，证明并表征了一个方案。观察到与理论建模的极好一致。对于大相位移动，观察到记忆效率的降解，但要克服的策略。
Strong nonlinear interactions between single photons have important applications in optical quantum information processing. Demonstrations of these interactions in cold atomic ensembles have largely been limited to exploiting slow light generated using electromagnetically induced transparency (EIT). However, these EIT implementations have limited achievable phase shifts due to spontaneous emission. Here, we demonstrate and characterize a scheme free from these limitations using gradient echo memory with inferred single photon phase shifts of $0.07\pm0.02$ $μ\text{rad}$. Excellent agreement with theoretical modelling was observed. Degradation of memory efficiency was observed for large phase shifts but strategies to overcome that are presented.
