Near-Perfect Broadband Quantum Memory Enabled by Spin-Wave Compaction

ScholarlyArticle: "Near-Perfect Broadband Quantum Memory Enabled by Intelligent Spin-Wave Compaction" (2025) https://arxiv.org/abs/2505.02424 :

> Abstract: [...] In this Letter, we break through these constraints by unveiling a Hankel transform spatiotemporal mapping for light-spin-wave conversion in quantum memory and proposing an intelligently light-manipulated strategy for spin wave compaction, which maximizes memory efficiency while suppressing excess noise. This strategy is experimentally demonstrated for a Raman quantum memory in warm 87 Rb [Rubidium 87] atomic vapor with an efficiency up to 94.6±1% and a low noise level of only 0.026±0.012 photon per pulse. The unconditional fidelity reaches 98.91±0.1% with an average of 1.0 photon per pulse for a 17 ns input signal. Our results successfully demonstrate a practical benchmark for broadband quantum memory that may facilitate advancements in high-speed quantum networks, quantum state manipulation, and scalable quantum computation.

NewsArticle: "Raman quantum memory demonstrates near-unity performance" (2025) https://phys.org/news/2025-11-raman-quantum-memory-unity.htm...