Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 48: Poster – Quantum Optics, Technologies, and Optomechanics
Q 48.6: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Remote sensing using an auxiliary quantum system — •Manuel Bojer1, Jörg Evers2, and Joachim von Zanthier1 — 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Quantum Optics and Quantum Information, Staudtstr. 1, 91058 Erlangen, Germany — 2Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
A key goal in the recently fast developing field of quantum sensing is the extraction of information about physical quantities with high precision using quantum features. Many different platforms or realisations of quantum sensors exist. A particular branch focuses on sensing tasks assisted by auxiliary systems, which aid for overcoming classical precision limits. In this work, we use the combined signal of a system of interest and a remote system, entangled with each other via measurements, to extract information that is otherwise difficult to access. The entire system consists of three identical atoms, where two atoms, representing the system of interest, are assumed to be close to each other such that they interact via the dipole-dipole interaction while the third atom is located at a distance d ≫ λ (with λ the atomic transition wavelength). Although the distant third atom does not directly interact with the collective two-atom subsystem, it can be used to alter the total systems emission properties via measurement-induced entanglement. We present different detection schemes employing Glauber’s third-order photon correlation function to extract important parameters such as the separation d (with potentially d ≪ λ) or the initial state of the two-atom subsystem.
Keywords: Higher-order correlation functions; Separation determination; Quantum state reconstruction