Coupling Electromagnetic Cavities to Nanowires (Ambizione)

Ambizione research project

This project, which is an independent research effort led by Dr. Floris Braakman as part of his Ambizione Grant, investigates the coupling electromagnetic cavities to nanowire mechanical resonators. We take two approaches. On the one hand we work on integrating a nanowire mechanical resonator with embedded quantum two-level system in an optical cavity. On the other hand we couple superconducting microwave cavities to mesoscopic mechanical resonators in a scanning probe type of setup.

Tripartite hybrid: quantum dot / mechanical resonator / optical Cavity

The coupling of different physical quantities forms the very foundation of fundamental experiments investigating quantum measurement. Through such coupling, it becomes possible to implement quantum non-demolition (QND) and weak measurements, and investigate decoherence mechanisms, quantum entanglement, and ultimately the transition from quantum to classical physics. An object which combines the coupled quantities in one, monolithic, unit forms a very powerful platform for the study of such effects. Nanowires are such objects, as they are excellent nanomechanical resonators, can host optically active quantum dots and additionally are prototypical systems expected to exhibit intruiging mesoscopic physics, such as that of emergent Majorana fermions and Luttinger liquids. In this project we aim to add another ingredient to the system: a strong light field.

Superconducting microwave cavity for scanning capacitance microscopy

Superconducting resonators can be made with high quality factors. Furthermore their resonance frequency can be influenced by a variable capacitive coupling to a second object. These two components form the building block of a scanning probe experiment that we pursue here: to measure with spatial resolution the quantum capacitance of mesoscopic samples.