Condensed Matter Physics Seminar

Brian D. Gerardot, Heriot-Watt University

Friday 03 May 2013, 1500-1600
C1 Physics Building

Title: Quantum optics with multi-level transitions in

semiconductor quantum dots

Abstract:

Strong quantum confinement has led to the observation of discrete, atom-like energy levels in solid-state quantum dots (QDs). Particularly promising for potential applications in quantum information science is the presence of multi-level atomic-transitions in single QDs. Here I will present a series of experiments probing the quantum states in both three-level (a so-called spin- system) and four-level quantum optical systems. The spin- system enables a single spin to be be initialized, coherently manipulated, and read-out using photons while the four level system enables the generation of entangled photon pairs on demand. I will also address the prospect of fine-tuning the quantum states using an externally applied uniaxial stress for desired applications. Finally, I will discuss the development of broad-band optical antennas to increase the efficiency of the light-matter interaction in our devices.