Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 53: Nano-Optics II
Q 53.1: Vortrag
Donnerstag, 17. März 2022, 14:00–14:15, Q-H11
Spectral stability of nitrogen-vacancy defect centers in diamond nanostructures — •Laura Orphal-Kobin1, Kilian Unterguggenberger1, Tommaso Pregnolato1,2, Natalia Kemf2, Mathias Mattala2, Ralph-Stephan Unger2, Ina Ostermay2, Gregor Pieplow1, and Tim Schröder1,2 — 1Department of Physics, Humboldt-Universität zu Berlin, Berlin, Germany — 2Ferdinand-Braun-Institute, Berlin, Germany
Coherent photons are an important resource for many quantum applications, for example, in long-distant quantum networks stationary qubits can be entangled by photon-mediated protocols. In solid-state systems, noise in the environment of a quantum emitter, such as fluctuations of the local charge density, lead to a change of the optical transition frequency over time and therefore to inhomogeneous broadening, which is referred to as spectral diffusion. Overcoming spectral diffusion is still a major challenge for solid-state quantum emitters and limits the generation of indistinguishable single photons.
In our work, we investigate the spectral properties of NV defect centers in diamond nanostructures by performing photoluminescence excitation measurements. We analyze the impact of different excitation parameters on the optical linewidth and spectral dynamics of the NV zero-phonon-line. Moreover, excitation power and energy-dependent measurements combined with nanoscopic Monte Carlo simulations provide fundamental insights, relating the spectral properties of the NV to its charge environment. Based on our results, we propose a protocol for entanglement generation using NVs in nanostructures.