Inlek I V, Crocker C, Lichtman M, Sosnova K, Monroe C
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
Phys Rev Lett. 2017 Jun 23;118(25):250502. doi: 10.1103/PhysRevLett.118.250502.
Trapped atomic ions are a leading platform for quantum information networks, with long-lived identical qubit memories that can be locally entangled through their Coulomb interaction and remotely entangled through photonic channels. However, performing both local and remote operations in a single node of a quantum network requires extreme isolation between spectator qubit memories and qubits associated with the photonic interface. We achieve this isolation by cotrapping ^{171}Yb^{+} and ^{138}Ba^{+} qubits. We further demonstrate the ingredients of a scalable ion trap network node with two distinct experiments that consist of entangling the mixed species qubit pair through their collective motion and entangling a ^{138}Ba^{+} qubit with an emitted visible photon.
捕获的原子离子是量子信息网络的主要平台，具有长寿命的相同量子比特存储器，这些存储器可以通过库仑相互作用进行本地纠缠，并通过光子通道进行远程纠缠。然而，在量子网络的单个节点中同时执行本地和远程操作需要旁观者量子比特存储器与与光子接口相关的量子比特之间实现极端隔离。我们通过共捕获(^{171}Yb^{+})和(^{138}Ba^{+})量子比特来实现这种隔离。我们通过两个不同的实验进一步展示了一个可扩展离子阱网络节点的组成部分，这两个实验包括通过混合物种量子比特对的集体运动使其纠缠，以及使一个(^{138}Ba^{+})量子比特与发射的可见光子纠缠。
