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Quantum Measurements and Optomechanics
Last Updated: 2026-02-05 16:15:04
Abstract
The measurement process is at the heart of both science and engineering. The limitations of measurement precision is ultimately dictated by the laws of quantum mechanics. This course provides the knowledge necessary to understand current state-of-the-art quantum measurement systems operating at their fundamental limits with a particular focus on optomechanical implementations.
Objective
The goal of this course is to understand both the standard and the ultimate quantum limits of measurement precision.
Content
The lecture starts with summarizing the relevant fundamentals of the treatment of noisy signals. We familiarize ourselves with the concept of measurement imprecision in light-based measurement systems. To this end, we consider the process of photodetection and discuss the statistical fluctuations arising from the quantization of the electromagnetic field into photons. We exemplify our insights at hand of concrete examples, such as homodyne and heterodyne photodetection. Furthermore, we focus on the process of measurement backaction, the inevitable result of the interaction of the probe with the system under investigation. We discuss the “standard quantum limit” as it arises from the balance of measurement imprecision and backaction, before turning to approaches to overcome it and reach the fundamental “Heisenberg limit”. The course emphasizes the connection between the taught concepts and current state-of-the-art research carried out in the field of optomechanics. Exercises serve to consolidate our understanding and insight.
General Information
- Language
- English
- Levels
- MSC
- Frequency
- Every two years
Examination
- Type
- graded semester performance
Course Components
| Type | Title | Time & Place | Hours |
|---|---|---|---|
| lecture |
Quantum Measurements and Optomechanics
Previously named Electromagnetic Precision Measurements and Opto-Mechanics (until HS23)
|
|
2 h weekly |
| exercise |
Quantum Measurements and Optomechanics
Previously named Electromagnetic Precision Measurements and Opto-Mechanics (until HS23)
|
|
1 h weekly |
Offered In
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Track: Electronics and Photonics (The core courses and specialisation courses below are a selection for students who wish to specialise in the area of "Electronics and Photonics", see . The individual study plan is subject to the tutor's approval.)
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Specialisation Courses (These specialisation courses are particularly recommended for the area of "Electronics and Photonics", but you are free to choose courses from any other field in agreement with your tutor. A minimum of 40 credits must be obtained from specialisation courses during the Master's Programme.)
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Major Courses (A total of 42 CP must be achieved during the Master Programme. The individual study plan is subject to the tutor's approval.)
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Recommended Subjects (These courses are recommended, but you are free to choose courses from any other special field. Please consult your tutor.)
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General Electives (Students may choose General Electives from the entire course programme of ETH Zurich - with the following restrictions: courses that belong to the first or second year of a Bachelor curriculum at ETH Zurich as well as courses from GESS "Science in Perspective" are not eligible here. The following courses are explicitly recommended to physics students by their lecturers. (Courses in this list may be assigned to the category "General Electives" directly in myStudies. For the category assignment of other eligible courses keep the choice "no category" and take contact with the Study Administration ( ) after having received the credits.))
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Electives (This is a selection of courses particularly suitable for the MSc QE. In agreement with the tutor, students may choose other courses from the ETH course catalogue.)
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