Andreas Lemmer

Email: andreas.lemmer[at]
Tel: +49-731-50-22904
Room O25/411
Institute for Theoretical Physics
Ulm University
Albert-Einstein Allee 11
D-89081 Ulm, Germany

My Research Interests

My research interests and activities are focused on the implementation of quantum information processing (QIP) and simulations of quantum dynamics with trapped ions. The high degree of control available in trapped ion experiments makes them a very versatile tool: trapped ions are one of the leading platforms for the implementation of QIP and quantum simulations while they can also be used to study statistical mechanics.
During my master thesis my work was focused on the implementation of QIP with trapped ions. We studied how the two-qubit entangling gate developed in A. Bermudez et al., Phys. Rev. A 85, 040302 (2012) can be converted into a geometric phase gate and how the gate’s fidelity evolves under typical noises present in ion trap experiments [1]. The results were extended in [2] where we studied the remaining sources of noise that were not covered in [1].
During my PhD studies my work was directed to the side of statistical mechanics in ion traps. In collaboration with the group of F. Schmidt-Kaler in Mainz we developed an approach to apply two-dimensional spectroscopy to study non-linear interactions in ion crystals [3].
Currently, I am working on a project for the simulation of spin-boson models with trapped ions which is done in close collaboration with the group of T. Schaetz in Freiburg.

My Publications

[1] Driven geometric phase gates with trapped ions
A. Lemmer, A. Bermudez, and M. B. Plenio
New J. Phys. 15, 083001 (2013)

[2] Noise studies of driven geometric phase gates with trapped ions
A. Lemmer, A. Bermudez, and M. B. Plenio; in Proceedings of the International School of Physics ‘Enrico Fermi,’ Course 189 ‘Ion Traps for Tomorrow’s Applications’, pp. 229-244, edited by M. Knoop, I. Marzoli, and G. Morigi
IOS Press, Amsterdam, 2015

[3] Two-Dimensional Spectroscopy for the Study of Ion Coulomb Crystals
A. Lemmer, C. Cormick, C. T. Schmiegelow, F. Schmidt-Kaler, and M. B. Plenio
Phys. Rev. Lett. 114, 073001 (2015)