论文标题
通过空间多路复用腔产生高度可检索的原子光子纠缠，并具有毫秒的寿命
Generation of highly retrievable atom photon entanglement with a millisecond lifetime via a spatially multiplexed cavity
论文作者
论文摘要
与光子量子纠缠的量子记忆是长距离量子中继器的基础。通过将双激光束涂在光晶格原子上，可以证明腔体增强和长期活的自旋波光子纠缠。但是，由于两个梁的交叉读数，与单个模式自旋波在所有存储时间相比，自旋波置量置保持量的检索效率降低了四分之一。在这里，通过将冷原子耦合到基于极化干涉仪的腔的两种模式，我们在腔体增强和长期寿命的原子光子纠缠中获得了完美的量子检索。将写激光束应用于冷原子上，然后创建一个磁场不敏感的旋转波值，该磁场与被编码在干涉仪的两个臂上的光子Qubit纠缠在一起。旋转波值以读取光束检索，从而避免交叉读数。我们的实验表明，在50％固有量子检索效率的540μs存储时间中，比报告结果最佳结果长13.5倍。
Qubit memory that is entangled with photonic qubit is the building block for long distance quantum repeaters. Cavity enhanced and long lived spin wave photon entanglement has been demonstrated by applying dual laser beams onto optical-lattice atoms. However, owing to cross readouts by two beams, retrieval efficiency of spin wave qubit is decreased by one quarter compared to that of single mode spin wave at all storage times. Here, by coupling cold atoms to two modes of a polarization interferometer based cavity, we achieve perfect qubit retrieval in cavity enhanced and long lived atom photon entanglement. A write laser beam is applied onto cold atoms, we then create a magnetic field insensitive spin wave qubit that is entangled with the photonic qubit encoded onto two arms of the interferometer. The spin wave qubit is retrieved by a read beam, which avoids the cross readouts. Our experiment demonstrates 540μs storage time at 50% intrinsic qubit retrieval efficiency, which is 13.5 times longer than the best reported result.
