MAGIC with Trapped Ions (Prof. C. Wunderlich)

  • Datum: 22.11.2016
  • Uhrzeit: 14:30 - 15:30
  • Vortragender: Prof. Dr. Christof Wunderlich, Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen
  • Raum: Herbert Walther Lecture Hall
  • Gastgeber: MPQ
Trapped atomic ions are a well-advanced physical system for quantum information science (QIS). QIS is meant to encompass the quest for a specialized, or even universal processor for quantum information, the investigation of fundamental questions of quantum physics, as well as applications of techniques emanating from these investigations to other fields, for example, precision spectroscopy and sensing.

After introducing elements of the physics of trapped atomic ions essential for using them for state-of-the-art experiments in QIS, I will report on recent experiments demonstrating a tailored and versatile effective spin system based on magnetic gradient induced coupling (MAGIC) between trapped Yb+ ions. Taking advantage of the simultaneous long range coupling between three spins, a coherent quantum Fourier transform—an essential building block for many quantum algorithms—is efficiently realized.

Precision sensing, and in particular high precision magnetometry, is an important goal of research into quantum technologies. Using a rf-dressed single Yb+ ion as a sensor, we achieve a unprecedented measurement sensitivity for high frequency fields close to the standard quantum limit. For an ac magnetic field near 14 MHz a sensitivity of 4.6 pT/ √Hz is attained.

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