Maunz P, Olmschenk S, Hayes D, Matsukevich D N, Duan L-M, Monroe C
Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742, USA.
Phys Rev Lett. 2009 Jun 26;102(25):250502. doi: 10.1103/PhysRevLett.102.250502. Epub 2009 Jun 25.
We demonstrate a probabilistic entangling quantum gate between two distant trapped ytterbium ions. The gate is implemented between the hyperfine "clock" state atomic qubits and mediated by the interference of two emitted photons carrying frequency encoded qubits. Heralded by the coincidence detection of these two photons, the gate has an average output state fidelity of 89+/-2%. This entangling gate together with single qubit operations is sufficient to generate large entangled cluster states for scalable quantum computing.
我们展示了两个远距离囚禁镱离子之间的概率纠缠量子门。该门在超精细“时钟”态原子量子比特之间实现，并由携带频率编码量子比特的两个发射光子的干涉介导。通过这两个光子的符合探测进行预示，该门的平均输出态保真度为89±2%。这个纠缠门与单量子比特操作一起足以生成用于可扩展量子计算的大纠缠簇态。
