Hamburg 2009 – wissenschaftliches Programm
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SYLV: Symposium Lokalisierung und Verschränkung in photoinduzierten Prozessen
SYLV 2: SYLV II
SYLV 2.4: Hauptvortrag
Montag, 2. März 2009, 18:00–18:30, VMP 8 HS
A long-distance quantum gate between matter qubits — •P. Maunz1, S. Olmschenk1, D. Hayes1, D. N. Matsukevich1, L.-M. Duan2, and C. Monroe1 — 1Joint Quantum Institute and Department of Physics, University of Maryland, College Park, MD 20742 — 2FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, MI 48109
We demonstrate a probabilistic entangling quantum gate [1] 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 [2]. The successful operation of the gate is heralded by the coincidence detection of these photons.
On average, the gate has a fidelity of 90% and a success probability of 2.2× 10−8. For one pair of input states for which we expect the antisymmetric Bell state as output, we perform full tomography of the output state and obtain a fidelity of F=0.87. We also apply this gate to teleport a quantum state between ytterbium ions separated by one meter [3].
This entangling gate together with single qubit operations is sufficient to generate large entangled cluster states for scalable quantum computing [4].
[1] L. Duan et al. Phys. Rev. A 73, 062324 (2006).
[2] D. L. Moehring et al. Nature 449, 68 (2007).
[3] S. Olmschenk et al. Science, to be published (2009).
[4] L. Duan and R. Raussendorf. Phys. Rev. Lett. 95, 080503 (2005).