Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 8: Photons and Photonic Quantum Processors

QI 8.7: Talk

Monday, March 18, 2024, 18:15–18:30, HFT-FT 131

Deterministic creation of isolated and ultra-bright quantum emitters in hexagonal boron nitride — •Safa L. Ahmed^1,2, Ioannis Karapatzakis², Luis Kussi², Marcel Schrodin², Rainer Kraft², Christoph Sürgers², and Wolfgang Wernsdorfer^1,2 — ¹IQMT, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — ²PHI, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

Single-photon emitters (SPEs) in hexagonal boron nitride (hBN) show fascinating applications in quantum information processing and quantum sensing. In order to utilize quantum emitters as sensors it is crucial to have stable SPEs. We create defects via AFM nanoindentation [1] on multilayer hBN flakes followed by high temperature annealing in Ar environment. This produces ultra-bright SPEs which do not photo-bleach due to charge build-up, and are both spatially and spectrally deterministic. A high yield of single isolated emitters is observed. Their second order correlation measurements and Debye-Waller factors show a high quantum yield. In addition, low temperature measurements were carried out that show spectral changes and emitter robustness to thermal cycles. Such deterministic surface quantum emitters could be incorporated into quantum sensing devices with enhanced spatial resolution and sensitivity.

Keywords: hBN; quantum sensing; quantum emitters; 2D device; color centres