| Popis: |
We introduce and demonstrate a new approach for enhancing quantum memory protocols, leveraging constructive light-matter interference within the memory. We implement this method with a Raman quantum memory in warm Cesium vapor, and demonstrate a more than three-fold improvement in total efficiency from $(10.4\pm0.5)\%$ to $(34.3\pm8.4)\%$ with the same peak control pulse intensity, whilst retaining the GHz-bandwidth of the memory and observing no increase in the measured noise. Numerical simulations further explore the performance of this method across different regimes, including low atomic density systems and scenarios with limited laser intensity. For systems limited by atomic density, such as cold atomic systems, we predict our method can boost the efficiency from $65\%$ to beyond $96\%$, while the same method applied to warm atomic vapors could potentially exceed $95\%$ efficiency with an order-of-magnitude reduction in intensity requirements. We also explore the effect on modal capacity and find that our protocol preserves the single-mode nature of the memory at significantly higher efficiencies. This protocol is broadly applicable to various quantum memory architectures, paving the way toward scalable, efficient, low-noise, and high-bandwidth quantum memories. |
