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TUT: Tutorials

TUT 2: Quantum Technologies (joint session HL/TT/TUT)

TUT 2.3: Tutorium

Sonntag, 11. März 2018, 17:15–17:50, H 0105

Josephson junction based interferometers and amplifiers — •Sebastian Kempf — Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany.

Advances in science, health care or other areas of everyday life are often accompanied by progress in physical instrumentation. The development of ultra-sensitive detectors and sensors is therefore of great importance and will not only influence our understanding of nature but also future examination methods in medical care or search strategies for natural resources. Quantum technology plays an important role in these developments as superconducting quantum devices (SQDs) are among the most sensitive measurement instruments presently existing and enabling fascinating investigations of tiniest signals.

Josephson junction based interferometers and amplifiers are a special class of SQDs which are very well suited for measuring variations of tiny magnetic fields or any other physical quantity that can be naturally converted into magnetic flux. They are based on the Josephson effects as well as magnetic flux conservation and are used not only for measuring biogmagnetic signals as induced for instance by the electrical currents within the human brain but also to read out cryogenic particle detectors, to explore mineral deposits within geoscience or for magnetic sensing at nanoscale level.

I will give an introduction into this fascinating field, discuss different kinds of devices such as the well-known superconducting quantum interference device and highlight several applications for which Josephson junction based interferometers and amplifiers are a key technology.