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Q: Fachverband Quantenoptik und Photonik
Q 25: Quantum Information: Quantum Computation II
Q 25.1: Vortrag
Dienstag, 24. März 2015, 14:30–14:45, C/HSO
Optical quantum memory made from single nuclear spin in nitrogen vacancy in diamond — •Sen Yang1, Ya Wang1, Thai Hien Tran1, S. Ali Momenzadeh1, Rainer Rainer Stoehr1, Philipp Neumann1, Hideo Kosaka2, and Joerg Wrachtrup1 — 13rd Physics Institute, Universitaet Stuttgart, Germany — 2Yokohama National University, Yokohama, Japan
Quantum repeater is one of the key elements to realise long distance quantum communication. In the heart of a quantum repeater is quantum memory. There are a few requirements for this memory: it needs to couple to flying qubits: photon ; it needs to have long coherence time, so quantum error correction algorithm can be performed in the quantum repeater nods ; it needs to be stable under optical illuminations.
Nitrogen nuclear spin is available for every nitrogen vacancy center(NV) in diamond. Besides it can be a robust quantum memory for spin qubit operations, nitrogen nuclear spin can couple to photon by taking advantage of optically resonant excitation of spin-selective transitions in low temperature. Here we demonstrate the coherent storage of quantum information from photon into nuclear spin. We show this quantum memory fulfils requirements as quantum memory for quantum repeater. Coherent time beyond 10 seconds is measured in C13 natural abundant sample. We show nuclear spin can keep its coherence over 1Million times resonant laser excitation of electron spin.