Quantum 2025 – wissenschaftliches Programm
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MON: Monday Contributed Sessions
MON 16: Quantum Spectroscopy
MON 16.3: Vortrag
Montag, 8. September 2025, 17:00–17:15, ZHG004
Retrieving lost atomic information of an optical quantum system — •Laura Orphal-Kobin1, Gregor Pieplow1, Alok Gokhale1, Kilian Unterguggenberger1, and Tim Schröder1,2 — 1Department of Physics, Humboldt-Universität zu Berlin, Berlin, Germany — 2Ferdinand-Braun-Institut, Berlin, Germany
The precise characterization of quantum systems is critical for exploring fundamental questions and for assessing their potential in quantum technologies. Many characterization methods and prospective quantum applications rely on the detection of single photons and are therefore often time-consuming and resource-intensive. In this work, we leverage statistical Monte Carlo simulations to retrieve information from undersampled experimental data [1].
We perform a photoluminescence excitation spectroscopy measurement to estimate the optical linewidth of a quantum emitter, here a single nitrogen-vacancy center in diamond. We emulate regimes of high and low photonic signals by adding a neutral density filter in the detection path of the setup. In a regime of weak signals, standard data analysis methods result in unphysically narrow linewidths. Using a Monte Carlo method, synthetic data is generated with different input parameters, here linewidth and detected photon number. The comparison of the simulations with experimental data sets allows to determine the system parameters with high accuracy even when the experimental data are undersampled. Therefore, the Monte Carlo method unlocks new experimental regimes in quantum optics.
[1] L. Orphal-Kobin et al., arXiv:2501.07951 (2025).
Keywords: quantum emitter; color centers in diamond; Monte Carlo simulations; PLE spectroscopy; data analysis