Integrated diamond photonic architecture for quantum registers
Optically active defect centers in diamond exhibit exceptionally long spin-coherence times suitable for stationary spin qubits with optical addressability. Motivated by the stringent fidelity and control requirements of scalable quantum registers, integrated diamond photonics offers a pathway toward...
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| Autore principale: | |
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| Natura: | Book/Monograph Tesi |
| Lingua: | inglese |
| Pubblicazione: |
Heidelberg
28 Jul. 2026
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| DOI: | 10.11588/heidok.00039123 |
| Soggetti: | |
| Accesso online: | Resolving-System, kostenfrei: https://nbn-resolving.org/urn:nbn:de:bsz:16-heidok-391235 Resolving-System, kostenfrei: https://doi.org/10.11588/heidok.00039123 Verlag, kostenfrei, Volltext: http://www.ub.uni-heidelberg.de/archiv/39123 Langzeitarchivierung Nationalbibliothek, kostenfrei: https://d-nb.info/1414756968/34 
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| Note sull'autore: | put forward by Mark Ulanov ; referees: Prof. Dr. Wolfram Pernice [und ein weiterer Gutachter] |
| Riassunto: | Optically active defect centers in diamond exhibit exceptionally long spin-coherence times suitable for stationary spin qubits with optical addressability. Motivated by the stringent fidelity and control requirements of scalable quantum registers, integrated diamond photonics offers a pathway toward efficient spin-photon interfaces. In this thesis, an integrated diamond nanophotonic framework is developed, aiming to overcome the current limitations of the diamond platform and advance diamond-based quantum registers. The theoretical framework is based on cavity-enhanced spontaneous emission via the Purcell effect, defined by the key constraints of high quality-factor-to-mode-volume ratios, spectral alignment, emitter position and polarization overlap. Based on these requirements, suspended one-dimensional photonic crystal nanobeam cavities in single-crystal diamond are designed and optimized using finite-element and finite-difference time-domain simulations, achieving sub-wavelength mode volumes and high theoretical quality factors at the zero-phononline wavelengths of silicon and germanium vacancy centers. A fabrication process is developed for monolithic diamond substrates, utilizing Faraday-cage angled etching to realize suspended nanobeam structures. To address spectral mismatch between emitter and cavity, an optoelectromechanical tuning mechanism is introduced, enabling dynamic control of resonance frequency. Optical characterization is performed using confocal photoluminescence measurements and evanescent fiber-to-on-chip-waveguide coupling techniques, enabling detailed characterization of the spectral and spatial properties of the fabricated devices. Overall, this work establishes a comprehensive approach to the design, fabrication, tuning, and characterization of diamond nanophotonic structures, establishing a foundation for a viable platform for scalable quantum photonic architectures. |
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| Descrizione fisica: | Online Resource |
| DOI: | 10.11588/heidok.00039123 |