Guia docente 2023_24 Escola de Enxeñaría de Telecomunicación

Contents

Topic	Sub-topic
1. Optical sources	Einstein’s theory of radiation. Quantum theory of radiation. Lifetime of excited states. Absorption and stimulated emission. Rabi Frequency and coherent population oscillations. Linewith and broadening mechanisms. Rate equations in laser systems Gain coefficient. Homogeneous and inhomogeneous gain saturation. Laser cavities and modes. Lasing threshold and mode amplification Diode lasers fundamentals
2. Channels of transmission	Information channels of information. Codification formats. Wave propagation in homogeneous dielectric media. Gaussian beams. Optical fibres. Propagation modes. Dispersion in optical fibres. Attenuation in optical fibres.
3. Production snd detection of single photons	Photon source characteristics and characterization methods. Overview of single photon sources: parametric down conversion, four wave mixing, quantum dots. Weak coherent pulses vs single photons. Single photon detectors: photomultiplier tubes, semiconductor-based detectors, superconductor-based detectors. Optical coherent detection .
4. Main experimental platforms of QKD.	Discrete variable QKD: polarization, phase and time encoding. Continuos variable QKD: Gaussian modulation, quadrature-amplitude modulation. Fiber based QKD vs Free space QKD. Measurement device independent QKD and Twin field QKD. Device-Independent QKD.