论文标题
218-IN多量量子记忆的实验实现
Experimental realization of a 218-ion multi-qubit quantum memory
论文作者
论文摘要
存储寿命和容量是表征量子内存性能的两个重要因素。在这里，我们在低温设置中报告了上述200个离子的稳定捕获，并通过测量随机选择的离子的相干时间在数百毫秒的顺序上通过测量随机选择的离子的相干时间来证明多数量的容量和较长的存储寿命。我们将复合微波脉冲在全球操纵Qubit状态以有效地表征不同的存储单元，并在有和没有交感神经冷却激光器的情况下比较量子记忆的性能，因此明确地表明了长期存储多个离子qubit的交感神经冷却的必要性。
Storage lifetime and capacity are two important factors to characterize the performance of a quantum memory. Here we report the stable trapping of above 200 ions in a cryogenic setup, and demonstrate the combination of the multi-qubit capacity and long storage lifetime by measuring the coherence time of randomly chosen ions to be on the order of hundreds of milliseconds. We apply composite microwave pulses to manipulate qubit states globally for efficient characterization of different storage units simultaneously, and we compare the performance of the quantum memory with and without the sympathetic cooling laser, thus unambiguously show the necessity of sympathetic cooling for the long-time storage of multiple ionic qubits.
