Cryogenic trapped-ion system for large scale quantum simulation
Cryogenic trapped-ion system for large scale quantum simulation
复制标题
DOI：
10.1088/2058-9565/aae0fe
复制
发表时间：
2019-01-01
影响因子：
6.7
通讯作者：
Monroe, C.
中科院分区：
文献类型：
--
作者：
Pagano, G.;Hess, P. W.;Monroe, C.
捕获离子系统是大规模量子计算和量子模拟最有希望的候选硬件之一。为了扩大这种设备的规模，有必要设计极高真空（XHV）环境，以防止背景气体破坏离子晶体。在这里，我们提出了一种新的低温离子捕获系统设计的长时间存储的大离子链。我们的设备是基于一个分段叶片离子阱封闭在一个4 K低温恒温器，这使我们能够定期捕获和保持超过100（171）Yb（+）离子数小时的线性配置，由于低背景气体压力从差分低温泵。我们通过记录离子链与分子背景气体之间的非弹性和弹性碰撞来表征XHV低温环境，测量低于10（-11）Torr的压力。我们还展示了相干的一个和两个量子位操作和近等距的离子间距链高达44个离子使用非谐轴向电位，为了使更好的检测和单离子寻址在大型离子阵列。我们预计，这种可靠的生产和寿命的提高大型线性离子链将使量子模拟的模型，是棘手的经典计算机建模。
Trapped-ion systems are among the most promising hardware candidates for large scale quantum computing and quantum simulation. In order to scale up such devices, it is necessary to engineer extreme-high vacuum (XHV) environments to prevent background gas from disrupting the ion crystal. Here we present a new cryogenic ion trapping system designed for long time storage of large ion chains. Our apparatus is based on a segmented-blade ion trap enclosed in a 4 K cryostat, which enables us to routinely trap and hold over 100(171)Yb(+) ions for hours in a linear configuration, due to low background gas pressure from differential cryo-pumping. We characterize the XHV cryogenic environment measuring pressures below 10(-11) Torr by recording both inelastic and elastic collisions between the ion chain and the molecular background gas. We also demonstrate coherent one and two-qubit operations and nearly equidistant ion spacing for chains of up to 44 ions using anharmonic axial potentials, in order to enable better detection and single ion addressing in large ion arrays. We anticipate that this reliable production and lifetime enhancement of large linear ion chains will enable quantum simulation of models that are intractable with classical computer modeling.