Quantum emitters in diamond and nitrides semiconductors

Guo, Yanzhao 2024. Quantum emitters in diamond and nitrides semiconductors. PhD Thesis, Cardiff University. Item availability restricted.

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Abstract

Quantum emitters in semiconductors are important candidates for the realization of quantum technology. Their discrete internal energy levels are the natural hosts for holding quantum information. For example, the single photon generation from these quantum emitters is the important building block for quantum photonics circuits. Additionally, spin-based quantum sensing paves a promising way to high-sensitivity and high-resolution sensing in real-life applications. However, due to the complex coupling to the solid-state environment, it is still a challenge to fabricate quantum emitters with both excellent optical and spin coherence properties. One solution is to use the photonics structures and advanced fabrication to improve these properties of the well-understood quantum emitters, such as negatively charged nitrogen-vacancy centres. Another path is to keep looking for and identifying novel quantum emitters with superior properties in semiconductors with better growth processes and commercial availability. In this thesis, I introduced the basic knowledge of quantum information and reviewed the recent progress on quantum emitters in semiconductors in chapter 1, described experimental method used in this thesis in Chapter 2. Chapters 3-7 are the research chapters. I investigated the laser-written waveguide-integrated negatively charged nitrogen-vacancy centres with excellent spin coherence properties in diamond in Chapter 3, developed an enhanced quantum sensor based on a laser-written integrated photonic diamond chip in Chapter 4. I demonstrated the photodynamics between multiple internal energy levels of quantum emitters in aluminium nitrides in Chapter 5. I reported the germanium-related and iron-related quantum emitters in free-standing gallium nitrides in Chapter 6, and fabricated the quantum emitters in gallium nitrides via laser writing in Chapter 7. The studies listed in this thesis would expand knowledge of quantum emitters in semiconductors and improve the understanding of the quantum technology based on the quantum emitters in semiconductors.

Item Type:	Thesis (PhD)
Date Type:	Completion
Status:	Unpublished
Schools:	Schools > Engineering
Uncontrolled Keywords:	1).Quantum emitters 2). Diamond 3).Nitrides semiconductors 4). Quantum information 5). Optically detected magnetic resonance 6).Coherent spins
Date of First Compliant Deposit:	15 April 2025
Last Modified:	15 Apr 2025 15:08
URI:	https://orca.cardiff.ac.uk/id/eprint/177703

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