Modular entanglement of atomic qubits using photons and phonons
Modular entanglement of atomic qubits using photons and phonons
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DOI：
10.1038/nphys3150
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发表时间：
2015-01-01
期刊：
影响因子：
19.6
通讯作者：
Monroe, C.
中科院分区：
文献类型：
--
作者：
Hucul, D.;Inlek, I. V.;Monroe, C.
量子纠缠是量子信息科学背后的核心资源，从量子计算和模拟（1，2）到增强的计量学（3）和安全通信（1）。这些应用需要对大型量子比特网络进行量子控制，以实现比传统设备更高的增益和速度。然而，随着系统尺寸的增大，传播纠缠变得困难或不可能。在这里，我们展示了模块化方法（4）的第一步，通过在存储在两个远程离子阱模块中的三个原子离子量子比特的集合上使用互补量子总线来缩放纠缠。模块内的纠缠是通过声子（5）的确定性近场相互作用实现的，模块之间的远程纠缠是通过光子（6）的概率相互作用实现的。这个最小的系统使我们能够解决与多个总线的纠缠同步的一般问题。它指出了一种模块化大规模量子信息架构的方向，这种架构承诺减少光谱拥挤，从而随着量子比特数量的增加，可能减少退相干（4）。我们产生这种模块纠缠比观察到的远程纠缠量子比特退相干速率更快，表明纠缠可以通过添加更多的模块来简单地缩放。
Quantum entanglement is the central resource behind quantum information science, from quantum computation and simulation(1,2) to enhanced metrology(3) and secure communication(1). These applications require the quantum control of large networks of qubits to realize gains and speed increases over conventional devices. However, propagating entanglement becomes difficult or impossible as the system grows in size. Here, we demonstrate the first step in a modular approach(4) to scaling entanglement by using complementary quantum buses on a collection of three atomic ion qubits stored in two remote ion trap modules. Entanglement within a module is achieved with deterministic near-field interactions through phonons(5), and remote entanglement between modules is achieved with a probabilistic interaction through photons(6). This minimal system allows us to address generic issues in the synchronization of entanglement with multiple buses. It points the way towards a modular large-scale quantum information architecture that promises less spectral crowding and thus potentially less decoherence as the number of qubits increases(4). We generate this modular entanglement faster than the observed remotely entangled qubit-decoherence rate, showing that entanglement can be scaled simply by adding more modules.