High efficiency and low noise quantum memory with warm atomic cell inside a cavity

Abstract

High performance quantum memory for quantized states of light is a building block of quantum information technology. Despite great progresses of optical quantum memories based on interactions of light and atoms, physical features of these memories still cannot satisfy requirements for applications in practical quantum information systems, since all of them suffer from trade off between memory efficiency and excess noise. Here, we report a high-performance cavity enhanced electromagnetically induced transparency memory with warm atomic cell in which a scheme of optimizing the spatial and temporal modes based on the time-reversal approach is applied. The memory efficiency up to 67 ± 1% is directly measured and atom interaction, and a noise level close to quantum noise limit is simultaneously reached, which enable the high fidelity quantum memory. Thus, the realized quantum memory platform is ready to be applied in quantum information systems.