A study of preservation, identification, and randomness of quantum resources in composite quantum systems.

Khazaei Shadfar, Mahshid (2024). A study of preservation, identification, and randomness of quantum resources in composite quantum systems. Thèse. Québec, Doctorat en Technologies de l'information et des communications et en sciences de l'énergie et des matériaux, Université du Québec, Institut national de la recherche scientifique, 93 p.

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Résumé

This ongoing Ph.D. thesis presents original research that highlights the study of quantum resource identification and preservation, as well as high-dimensional randomness in quantum systems. In Part I, the thesis centers on identifying memory effects in high-dimensional open quantum systems and delves into the dynamical control of quantum resources in open systems, which is currently a key requirement for reliable quantum-enhanced technologies. In Part II, the investigation shifts to the concept of randomness, highlighting the role of the time-multiplexing approach in achieving high-dimensional quantum state preparation, which is fundamental to the functioning, security, and understanding of quantum resources.

Part I focuses on the characterization of quantum resources, including coherence and non- Markovianity, and their preservation within composite open quantum systems. It introduces a reliable witness for identifying memory effects in open multiqubit systems, which aligns consistently with measures of quantum negativity and quantum correlation. Furthermore, it explores the capability of the frequency modulation technique to speed up the evolution of a qubit while also facilitating the protection of quantum coherence through an optimized quantum witness, as opposed to a standard quantum witness. Additionally, it investigates the potential of frequency modulation to mitigate the detrimental effects of temperature on quantum systems.

Part II proposes a theoretical and experimental framework for investigating and utilizing a timemultiplexed approach, based on a beam-splitter cascade, to achieve high-dimensional quantum state preparation, ensuring high-quality randomness.

The contributions of this thesis enhance our understanding of the framework of open quantum systems. Additionally, the research offers practical methods for using the time-multiplexed heralded singlephoton source as a useful source of randomness. These findings provide essential insights for quantum information processing and create new opportunities for future research in the development of quantum technologies.

Type de document:	Thèse Thèse
Directeur de mémoire/thèse:	Lo Franco, Rosario
Co-directeurs de mémoire/thèse:	Morandotti, Roberto
Mots-clés libres:	-
Centre:	Centre Énergie Matériaux Télécommunications
Date de dépôt:	27 août 2025 17:58
Dernière modification:	27 août 2025 17:58
URI:	https://espace.inrs.ca/id/eprint/16613

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