A Fabry-Pérot Microcavity for Quantum Optics with Atomic Defects in Diamond

Download or read book A Fabry-Pérot Microcavity for Quantum Optics with Atomic Defects in Diamond written by Erika Janitz and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The peculiar laws of quantum physics offer a mechanism for exploring fundamentally new types of information processing that promise unprecedented speed and security. Realizing this technology requires a quantum system that can be controlled with exquisite precision, and which can be duplicated and combined into a scalable quantum network. Quantized magnetic moments in diamond, controlled using light via an atom-like defect called the germanium vacancy center, are an example of such a system. The central goal of the work pursued in this thesis is to develop an efficient optical interface for such defects through coupling to an optical cavity, thereby increasing the strength of their interaction with light. To that end, we present progress toward developing a tunable cavity platform using a microscopic mirror fabricated on the tip of an optical fiber. The first manuscript provides a detailed characterization and model of the optical modes of this system. The model takes into account different sources of loss, such as scattering, absorption, and clipping losses at the fiber mirror resulting from coupling to higher order modes. The second manuscript provides a demonstration of room-temperature cavity coupling to a single emitter. We observe emission into the cavity mode beyond what is possible by filtering effects, resulting in an increased spectral density of cavity fluorescence. In the final manuscript, we actively stabilize the cavity length to the frequency of a laser, achieving a feedback bandwidth of 44 kHz. The laser frequency could in turn be stabilized to the fixed frequency of an emitter optical transition, thereby reducing the cavity detuning. Moving forward, this system can be cooled to cryogenic temperature where it should be possible to achieve a strong enhancement of coherent emission into the cavity mode. Such a device would directly impact progress towards building a scalable quantum information processing network and will open new avenues for exploring fundamental physics"--