Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 65: Quantum information: Quantum computers and communication II
Q 65.2: Vortrag
Freitag, 21. März 2014, 14:15–14:30, DO26 207
NV- based quantum repeaters — •Burkhard Scharfenberger1, William J. Munro2,1, Hideo Kosaka3, and Kae Nemoto1 — 1National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan — 2NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan — 3Reaserch Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
In the context of quantum information processing, the NV- center in diamond has been proposed and studied as a stable, optically readable solid state qubit and by now the basic techniques like initialisation and (single-shot) readout have been successfully demonstrated.
Here, we present a comparison of various schemes using the NV- center as a node within a quantum repeater. This is based on detailed studies looking at achievable fidelities for coherent manipulation of NV centers with and withough adjacent, strongly hyperfine-coupled carbon 13C nuclear spin where we found, that a bare NV-center allows high-fidelity control with simple square driving pulses, while this is only approxixmately true only when ignoring the nitrogen spin.
The repeater schemes we considered therefore use no more than one local memory qubit at each node, relying on high fidelity of the initial entangling link. Entanglement swapping can be achieved either via local gate operations as in the standard repeater or by making use of the special structure of the A2 state in the NV's excited state manifold.