arXiv 2402.062082024-02-09quant-ph

实现大动量转移而不交换拉曼光束方向

Implementation of large momentum transfer without swapping the directions of the Raman beams

Jinyang Li, Jason Bonacum, Selim M. Shahriar

AI总结：

提出一种无需物理交换拉曼光束方向即可实现大动量转移的简化方法，利用后向反射和多普勒频移分离跃迁频率，并成功应用于原子加速度测量。

摘要：

大动量转移（LMT）是放大原子干涉仪中累积相位偏移的重要技术。现有的基于拉曼跃迁的LMT实现方法均需反复物理交换两束对向传播的拉曼光束的传播方向，这可能显著增加实验系统的复杂性。在此，我们展示了一种更简单的基于拉曼跃迁的LMT方法，该方法无需物理交换拉曼光束的方向。在该方法中，两束拉曼光束均被后向反射，并利用原子偏置速度引起的多普勒频移来分离两对相向传播的拉曼光束的跃迁频率。因此，通过将两束拉曼光束之间的相对频率从一对拉曼光束的共振频率移至另一对拉曼光束的共振频率，即可实现拉曼光束方向的有效交换。我们演示了将该技术用于从磁光阱释放的原子的LMT增强加速度测量。

英文摘要：

Large momentum transfer (LMT) is an important technique for magnifying the phase shift accumulated in an atom interferometer. Existing approaches to implement Raman-transition-based LMT all involve physically swapping the propagation directions of the two counterpropagating Raman beams repeatedly, which could significantly complicate the experimental system. Here, we demonstrate a simpler approach for Raman-transition-based LMT that does not involve a physical swap of the directions of the Raman beams. In this approach, both Raman beams are retroreflected, and a Doppler shift induced by a bias velocity of the atoms is used to separate the transition frequencies of the two pairs of counterpropagating Raman beams. Therefore, an effective swap of the directions of the Raman beams can be achieved by shifting the relative frequency between the two Raman beams from the resonant frequency of one pair of the Raman beams to that of the other pair. We demonstrate the use of this technique for LMT-augmented accelerometry using atoms released from a magneto-optic trap.

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