Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Poster Session: Spintronics; Spin-controled transport; Topological insulators; Interfaces / Surfaces; Magnetic semiconductors

HL 29.4: Poster

Montag, 11. März 2013, 16:00–20:00, Poster A

Spin Noise Spectroscopy - towards solid-state entanglement — •Agnes Beichert¹, Fabian Berski¹, Andreas D. Wieck², Jens Hübner¹, and Michael Oestreich¹ — ¹Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany — ²Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstr. 150, D-44780 Bochum, Germany

In the context of quantum information processing dopants in semiconductor hosts are attractive candidates for providing a sufficient number of indistinguishable pure states on a nanoscale level [1]. Entanglement can be used to build up a non-local interaction between these states.

First, spin noise spectroscopy (SNS) is applied as a quantum non-demolition measurement to determine the temporal limit for coherent manipulation of the system state. Therefore, the spin dynamics of localised donor bound electron spins in GaAs is examined. The experiment shows spin dephasing dominated by hyperfine coupling [2].

Next, we want to expand the experiment to create entanglement between a solid state spin ensemble. Subsequently, we plan to use density matrix tomography to verify the prepared state [3].

[1] K.-M. C. Fu et al., Millisecond spin-flip times of donor-bound electrons in GaAs, Phys. Rev. B 74, 121304(R) (2006).

[2] G. M. Müller et al., Semiconductor spin noise spectroscopy: Fundamentals, accomplishments, and challenges, Physica E 43, 569 (2010).

[3] S. Simmons et al., Entanglement in a solid-state spin ensemble, Nature 470, 69 (2011).