We use alkali-metal vapor cells interfacing with confined light for building scalable quantum networks and sensitive magnetometry with high spatial resolution. In particular, we concentrate on the interaction of thermal rubidium atoms with the guided modes of slot and tapered waveguides integrated in a vapor cell. The advantage of these waveguides is the possibility of strong light-confinement in an area that overlaps with the atomic vapor. We will use a system consisting of a pair of coupled slot waveguides, which provides advanced technique for manipulation and design of the topological and chiral features of light. Overall, this integrated miniaturized device will represent a chip-scale hybrid building block for scalable quantum networks and sensitive magnetometry with high spatial resolution.
Details (to come)The coherent interaction of a single emitter with a quantized mode of the electromagnetic field, which is a basic system for the study of cavity quantum electrodynamics (cQED) is investigated here. We consider this system both as a unique model system for studying quantum phenomena at a fundamental level and as a realization of the quantum network protocols and systems. In particular, The ability to localize and manipulate an emitter inside a cavity, individually address internal states by laser fields in the case of the atoms, or engineer emission wavelength in the case of semiconductor emitters makes them one of the leading candidates for accessible preparation and robust storage in quantum information science
Details (to come)Although, non-Hermitian system have been diregarded by physicist for a long time, recent advances in the theory and experiment have sparked tremendeous interest in these systems for their unconventional behavior around exceptiona points (EPs). EPs are spectral singularities at which two or more eigenvalues and their associated eigenvectors coalesce. The particular feature of EPs, which we make use of in our investigations, is the enhanced sensitivity of the responce of energy eigenvalues to small external perturbations near an EP, making them ideal candidates for sensing applications. In particular, we have developed an enantioselectivity method based on the interaction of right- or left-handed molecules with a WGM-resonator operating at an EP.
Details (to come)Our ability to understand the nature is fundamentally based on sensors. Ini- tially, human beings used their five senses, sight, hearing, touch, taste, and smell to probe the world. Over time scientific instruments, such as microscopes, replaced our natural senses to better characterize and understand the phenom- ena around us. Diverse sensing are applications are in focus of our investigations. We use development of technologies to develope sensing devices. In particular, we use a variety of optical sensors, which are based on propagation and interaction of light and change of intensity, phase, polarization, frequency detected in the output signal. The range of applications varies from distant detection of a human movement and ultrasensitive detection of gas molecules.x
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