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TUNABLE NONRECIPROCAL COUPLING BETWEEN TWO QUANTUM MODULES

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Abstract
Nonreciprocity is an important property for building interesting and complex quantum systems and for their applications to quantum information processing. In this thesis, we show a low-loss waveguide circulator, a nonreciprocal device, and the understanding about its internal structure as multi-mode hybrid quantum system. Furthermore, we show the circulator integrated with superconducting niobium cavities, and the tunable nonreciprocal interactions between the intra-cavity photons due to coherent coupling to chiral internal modes. %between the intra-cavity photons. which can be presented through effective non-Hermitian dynamics of this system. Based on this platform, we integrate superconducting transmon qubit into the system and explore the nonreciprocal dispersive-type interaction between a transmon qubit and a superconducting cavity, and we introduce a general master-equation model to discribe the observed qubit-cavity dynamics agnostic to the intermediary system. This study demonstrates an example of a new class of quantum nonreciprocal phenomena beyond typical non-Hermitian Hamiltonians and cascaded systems.
Type
Dissertation (Open Access)
Date
2025-05
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License
Attribution-NonCommercial-NoDerivatives 4.0 International
License
http://creativecommons.org/licenses/by-nc-nd/4.0/
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