Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 53: Poster: Quantum Optics and Photonics III

Q 53.55: Poster

Donnerstag, 9. März 2017, 17:00–19:00, P OG2

Generation and evaluation of entangled multipartite nuclear spin states — •Stefan Jesenski, Sebastian Zaiser, Johannes Greiner, Philipp Neumann, Durga Dasari, and Jörg Wrachtrup — 3rd Institute of Physics, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

Multipartite entangled states are key for many quantum information protocols. Generation of these states and their protection against various noise sources is quintessential for successful quantum computing and sensing applications. Here we discuss the generation and minimally invasive characterization of multipartite entangled nuclear spin states coupled to a single Nitrogen-Vacancy center (NV) in diamond. At low temperatures, resonant optical excitation of the NV becomes possible allowing for high fidelity projective spin readout and spin initialization. In combination with spin-lifetimes many orders of magnitude higher compared to ambient conditions, generation of multipartite entangled states becomes plausible by optical methods possibly assisted by microwave fields. We present a scheme and evaluate the fidelities involved in optimal generation and measurement of five qubit entangled states for realistic parameters.