Ultrastrong Coupling Effects in Spin-Photon Interactions with Hole Spins
Quantum computing with semiconductor quantum dots offers a scalable platform compatible with industrial fabrication. Among the available qubit realisations, hole spins confined in double quantum dots stand out due to their strong intrinsic spin–orbit interaction and long coherence times. Recent expe...
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| Formato: | tesis de maestría |
| Estado: | Versión enviada para evaluación y publicación |
| Fecha de publicación: | 2025 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:dnet:digitalcsic_::c4c6ced65d5d85679ff422321281f3ba |
| Acesso em linha: | http://hdl.handle.net/10261/428480 |
| Access Level: | acceso abierto |
| Palavra-chave: | quantum computing double quantum dots hole spins spin–photon coupling ultrastrong regime spin–orbit interaction computación cuántica puntos cuánticos dobles espines de huecos acoplamiento espín–fotón régimen ultrastrong interacción espín–órbita |
| Resumo: | Quantum computing with semiconductor quantum dots offers a scalable platform compatible with industrial fabrication. Among the available qubit realisations, hole spins confined in double quantum dots stand out due to their strong intrinsic spin–orbit interaction and long coherence times. Recent experiments have demonstrated strong spin–photon coupling to microwave resonators, reaching interaction strengths that border the ultrastrong coupling regime. In this work, we theoretically analyse a hybrid system consisting of a hole spin in a double quantum dot coupled to a single-mode photonic cavity. Starting from a full four-level spin Hamiltonian, we identify and quantify the effective interaction terms between spin and photon degrees of freedom. Particular attention is paid to the emergence of spin–flip tunnelling contributions and counter-rotating terms that arise beyond the rotating-wave approximation. By parametrising the spin and charge photon coupling strengths, we study how counter-rotating terms introduce corrections to the physics of the hybrid system. We have also solved the ground state of the hybrid system. Our results provide analytical insight into additional coupling terms relevant in the ultrastrong regime, offering guidance for interpreting current experiments and designing future hybrid hole spin–photon architectures. |
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