Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 18: Poster II

QI 18.11: Poster

Wednesday, March 20, 2024, 11:00–14:30, Poster A

A simple demonstration experiment of entanglement using the nuclear and electron spin of nitrogen vacancy centers in diamond — •Tim Duka, Lina M. Todenhagen, and Martin S. Brandt — Walter Schottky Institut and School of Natural Sciences, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany

Entanglement is the key resource that distinguishes quantum from classical technology and allows for example quantum computation to gain advantages over classical computation. On the other hand, entanglement is not a phenomenon that we can observe in our everyday lives, which makes experiments that demonstrate this phenomenon important for educational purposes. The nitrogen vacancy (NV) center in diamond is one of the most promising platforms for quantum applications in solid state systems at room temperature. Its electron spin can be read out and initialized with the use of its spin-dependent photoluminescence and optical spin pumping, respectively. Furthermore, driving a microwave field at the resonance frequency of the electron spin transition allows for optically detected magnetic resonance (ODMR) experiments that can be sensitive to the hyperfine splitting caused by the state of the nitrogen nuclear spin. This enables the application of electron spin rotations conditioned on the nuclear spin as well as single spin rotations. Here, we present a fairly simple demonstration of entanglement between the electron spin and the nitrogen nuclear spin of a NV center in diamond that can be performed by students, at room temperature, and on a typical confocal microscopy setup.

Keywords: Nitrogen Vacancy Center; Entanglement; Diamond