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Bulletin of the American Physical Society

Freezing motion-induced dephasing for single spin-state stored in atomic ensemble

Yan Jiang, Jun Rui, Xiao‐Hui Bao, Jian-Wei Pan

Published May 25, 2016• 0 citations
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Long-lived storage of arbitrary transverse multimodes is important for establishing a high-channel-capacity quantum network. Most of the pioneering works focused on atomic diffusion as the dominant impact on the retrieved pattern in an atom-based memory. In this work, we demonstrate that the unsynchronized Larmor precession of atoms in the inhomogeneous magnetic field dominates the distortion of the pattern stored in a cold-atom-based memory. We find that this distortion effect can be eliminated by applying a strong uniform polarization magnetic field. By mapping signal light into a spin wave between a pair of clock states, the destructive interference between different spin-wave components is diminished, and the stored localized patterns are synchronized further in a single spin-wave component; then, an obvious enhancement in preserving patterns for a long time is obtained. The reported results are promising for studying transverse multimode decoherence in optical storage and may find potential applications in the field of high-dimensional quantum networks in the future.