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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster III
Q 42.29: Poster
Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof
Quantumness and speedup limit of a qubit under transition-frequency modulation — •Amin Rajabalinia1, Mahshid Khazaei Shadfar2,3, Farzam Nosrati2,3, Ali Mortezapour1, Roberto Morandotti3, and Rosario Lo Franco2 — 1Department of Physics, University of Guilan, P. O. Box 41335-1914, Rasht, Iran — 2Dipartimento di Ingegneria, Universit`a di Palermo, Viale delle Scienze, 90128 Palermo, Italy — 3INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
we investigate the ability of a frequency-modulated qubit embedded in a leaky cavity to maintain quantumness. To detect quantum coherence as the main distinguishing feature of the quantum world from the classical one, tomographic methods are used to reconstruct the density matrix of quantum systems. Although the implementation of such a strategy poses a technical challenge in terms of experimental measurement settings, Leggett-Garg inequality and quantum witness have been introduced as quantum indicators to quantify the nonclassicality of a system in order to overcome the complexity of detection in the experiment. The quantum witness is based on the classical no-signaling-in-time assumption, which states that a previous experiment has no effect on the statistical outcome of the subsequent experiment. We compare a standard quantum witness (SQW) and a recently introduced optimized quantum witness (OQW) as experimentally friendly figures of merit [Phys. Rev. A 101, 012331 (2020)]. The OQW successfully identifies quantum coherence protection via frequency modulation, whereas the SQW fails.