Quantum-noise of the electromagnetic field is one of the major noise sources in advanced interferometric grvitational wave detectors. Two sources of quantum noise need to be considered: Shot noise arises from uncertainty due to quantum fluctuations in the number of photons at the interferometer output. Radiation pressure noise arises from the uncertainties in the mirror positions due to quantum fluctuations of internal fields. The sum in quadrature of both contributions leads to the so-called Standard-Quantum-Limit (SQL) and has long been thought to describe a fundamental boundary for detector sensitivities. During the last decade it has been shown that quantum correlated light (nonclassical light) is able to break the SQL. The lectures will introduce proposed concepts for nonclassical interferometry, like squeezed light injection, ponderomotive squeezing and speed meters as well as first experiments.
- Introduction into Quantum Optics
- Non-Classical Light