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Q: Fachverband Quantenoptik und Photonik
Q 33: Quantum Gases: Bosons IV
Q 33.1: Talk
Wednesday, March 8, 2023, 14:30–14:45, A320
Tomography of a number-resolving detector by reconstruction of an atomic many-body quantum state — •Mareike Hetzel1, Luca Pezzè2, Cebrail Pür1, Martin Quensen2, Andreas Hüper1,5, Jiao Geng3,4, Jens Kruse1,5, Luis Santos6, Wolfgang Ertmer1,5, Augusto Smerzi2, and Carsten Klempt1,5 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Germany — 2QSTAR and INO-CNR and LENS, Firenze, Italy — 3Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, Westlake University, Hangzhou, China — 4Institute of Advanced Technology, Westlake Institute for Advanced Study, Hangzhou, China — 5Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), DLR-SI, Hannover, Germany — 6Institut für Theoretische Physik, Leibniz Universität Hannover, Germany
The high-fidelity analysis of many-body quantum states of indistinguishable atoms requires the accurate counting of atoms. Here we report the tomographic reconstruction of an atom-number-resolving detector. The tomography is performed with an ultracold rubidium ensemble that is prepared in a coherent spin state by driving a Rabi coupling between the two hyperfine clock levels. The coupling is followed by counting the occupation number in one level. We characterize the fidelity of our detector and show that a negative-valued Wigner function is associated with it. Our results offer an exciting perspective for the high-fidelity reconstruction of entangled states and can be applied for a future demonstration of Heisenberg-limited atom interferometry.