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QI: Fachverband Quanteninformation
QI 31: Decoherence and Open Quantum Systems
QI 31.10: Talk
Friday, March 22, 2024, 12:00–12:15, HFT-FT 101
Telling different unravelings apart via nonlinear quantum-trajectory averages — Eloy Piñol1, Themistoklis K. Mavrogordatos1, Dustin Keys2, •Romain Veyron1, Piotr Sierant1, Miguel Angel García-March3, Samuele Grandi1, Morgan W. Mitchell1,4, Jan Wehr2, and Maciej Lewenstein1,4 — 1ICFO – Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain — 2Department of Mathematics, The University of Arizona Tucson, AZ 85721-0089 USA — 3Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, Camino de Vera, s/n, 46022 Valencia, Spain — 4ICREA – Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain
We propose a way to experimentally distinguish different unravelings of the Gorini-Kossakowski-Sudarshan-Lindblad master equation appealing to stochastic conditional dynamics via quantum trajectories. Our proposal is based on performing a nonlinear operation on single-trajectory quantum mechanical averages and subsequently averaging over all different realizations comprising the ensemble. We focus on the paradigmatic quantum nonlinear system of resonance fluorescence for the two most popular unravelings: the Poisson-type, corresponding to direct detection of the photons scattered from the two-level emitter, and the Wiener-type, revealing complementary attributes of the scattered field such as the wave amplitude and the spectrum. Our proposal is tested against commonly met limitations in current experimental setups.
Keywords: Quantum trajectories; Photon counting; Homodyne detection; Single neutral atom; Maltese cross coupling