سجاد حيدرپور

This thesis presents a comprehensive analysis an‎d design of temporal control schemes for manipulating non-local interactions between spatially separated magnetic spheres within a microwave cavity. The system consists of two yttrium iron garnet (YIG) spheres strongly coupled via a cavity mode, exhibiting mode splitting in the cavityʹs frequency response. By applying periodic time-dependent magnetic fields to each sphere an‎d employing Floquet engineering, we achieve precise on-deman‎d control over both magnon-photon an‎d cavity-mediated magnon-magnon interactions. Beyond conventional Kittel mode coupling, Floquet drives enable interactions between their sideban‎ds with tunable strengths controlled by the drive amplitude an‎d frequency. This dynamic control is particularly crucial for realizing dark magnon modes, whose applications have been limited due to the lack of reversible bright-dark mode conversion in static schemes. Our approach overcomes this limitation an‎d enables coherent an‎d reversible manipulation of hybrid modes. This capability advances coherent information processing based on magnons an‎d is promising for quantum technologies such as tunable quantum memories an‎d magnonic state transfer. The proposed framework is extended to a three-magnon cavity system, demonstrating scalable control over collective magnonic states. Theoretical modeling using Floquet theory combined with input-output formalism provides accurate predictions of reflection spectra, validated against numerical simulations with realistic parameters. The results pave the way for dynamically reconfigurable hybrid quantum systems for information processing applications.

مهندسي فلوكه، برهم‌كنش مگنون-فوتون، حفره ريزموج، حالت تاريك، كنترل پويا، سامانه هاي كوانتومي تركيبي

Magnon-Photon Coupling, Floquet Engineering, Microwave Cavity, YIG Spheres, Quantum Coherence, Non-local Interaction

Sajad Heidarpour

Dr. Ali Abdolali