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Q: Fachverband Quantenoptik und Photonik
Q 23: Nano-Optics (Single Quantum Emitters) I
Q 23.7: Vortrag
Mittwoch, 11. März 2020, 12:45–13:00, a310
Optical Ramsey Spectroscopy on a Single Molecule — •Yijun Wang1, Guilherme Stein1, Vladislav Bushmakin1, Jörg Wrachtrup1,2, and Ilja Gerhardt1 — 13. Institute of Physics, University of Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany
High-quality single photon emitters are an important building block in the field of quantum technologies. The organic dye molecule dibenzanthanthrene (DBATT, C30H16) is a notable single photon emitter that allows for high single photon purity, high photon flux and narrow-band emission simultaneously. In this work, we validate that the linewidth of the emission from the molecule can reach the Fourier limit under cryogenic conditions. We measure the transverse relaxation time T2 by the Ramsey Spectroscopy, i.e. by applying two optical π/2 pulses with an interval τ on the molecule. Alternatively, we also get T2 from the linewidth at low power limit. By confirming that T2 is governed by the longitudinal relaxation time T1, we conclude that the dephasing processes in the system are negligible and the linewidth of the emitted photon is truly Fourier limited, which makes the emitter ideal for quantum interference experiments.