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Project wiki for the Module QT5201U - AY20/21S2

Welcome to the wiki project page. This will be the place for documenting projects. To be able to write something to this wiki, we need to create a user login manually. If you have not yet created an account, do let me know - Christian.

Project proposals

Here, links/short descriptions to projects should be listed.

Example project

This is just a dummy project.

Pulsed laser inteferometry/Ion Trap 'RF can' stabilisation (Mu Young & Wen Yi)

Interferometry between pulsed Raman beams driving qubit transition in Ytterbium 171+ ions OR Stabilisation of 'RF can' driving AC voltages across electrodes in a Paul ion trap.

Saturated Absorption Spectroscopy + Frequency Modulation Locking on the D2 line of Rubidium 87

With a combination of the Saturation Spectroscopy and Frequency Modulation techniques, we aim at stabilizing the wavelength of a Diode Laser at approximately 780.241 nm which corresponds to the transition $S_{1/2}\to P_{3/2}$ (also known as D2 line) of Rubidium 87. Additionally we will implement in the experiment a Red Pitaya, which is a minicomputer capable of replacing things like an Oscilloscope, Function Generator and PID controller, consequently reducing the space needed for the experiment.

Material requests

Please add stuff we should organize one way or the other here:

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Stuff to be covered in the lecture slots on Mondays

Feel free to add topics or aspects to this list. At the moment, this is just a copy of the tentative syllabus:

Date	Topic	Description
18.1. 2021	Paraxial optics	Optical systems often work with Gaussian beams. We cover practical design techniques like the ABCD matrix formalism for simple optical systems.
	Optical cavities	Many optical techniques require to work with optical cavities. We cover how to design them, and how to couple light into very basic devices.
	Optical fiber technology	Some properties of optical fibers as the most common optical waveguide are covered, including optical mode spectrum, dispersion and transmission properties.
	Practical aspects of superconducting systems	We cover different materials, transition temperatures, temperature measurement techniques and thermal insulation / conduction techniques.
	Frequency control of laser systems	Many laser systems in quantum technologies require to have a well-defined frequency relationship with atomic transitions of solid state qubits. We cover typical techniques how laser systems can be controlled to a high enough accuracy, utilizing spectroscopy techniques and control systems.
	Homodyne detection techniques	Measurement of optical fields in many continuous variable scenarios require knowledge of optical homodyning and heterodyning techniques.
	Generating pulse sequences	Many quantum systems require short control pulses, either in form of optical pulses or radiofrequency pulses. We present a few techniques to generate such control pulses
	Interface to computers	High level interfacing between computers and electronic hardware: Simple python scripting, standard device languages
	High voltage techniques	Working with high voltages requires a spectrum of techniques that is differing from more conventional electronics. A few aspects (field emission, dielectric strength, specific components) are covered.
	Electro-optics, Accousto-optics, liquid crystals	Many optical modulation techniques require rely on devices or materials where optical properties can be changed electrically; we cover accousto-optical and electro-optical devices, as well as liquid crystal systems.

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