Can we find a promising real-world application of quantum mechanics? This question has intrigued physicists for more than half a century. Today, the quantum computer is widely believed to be the most promising one. Interestingly, this belief might turn out to be incomplete. In recent years numerous other applications have emerged that employ quantum mechanical systems as sensors for various physical quantities such as magnetic or electric fields. The lecture is an introduction into all these applications. After teaching the language of quantum information processing it will cover various applications such as
• quantum computing
• atomic clocks and GPS
• superconducting SQUID magnetic field sensors for sensing of currents in the brain
• protocols of nuclear magnetic resonance spectroscopy and their application in biochemistry
• NV centers in diamond and their potential use for imaging of the magnetic fields of single molecules, hard disk write heads and neuronal currents.
• decoherence of quantum systems; what it is, how it arises and how it can be mitigated in applications