Milan Holzäpfel

Email: milan.holzaepfel[at]
Tel: +49-731-50-22920
Room O25/413
Institute for Theoretical Physics
Ulm University
Albert-Einstein Allee 11
D-89081 Ulm, Germany

My Research Interests

One of my main research interests is applying and improving techniques for quantum state tomography which are efficient also for quantum systems composed of a large number of qubits or other subsystems. These techniques are based on matrix product states/tensor trains (MPS/TT) and I have worked with many related standard algorithms such as DMRG and TEBD. In addition, there are many relations between MPS/TT methods and entanglement and quantum information theory. I also work on questions related to linear optics quantum computing.

mpnum (available from is an easy-to-use Python library for MPS/TT methods. I am one of its authors.

In short:

– Quantum information theory, especially state and process tomography
– Efficient state tomography
– Matrix product state/tensor train (MPS/TT) methods
– Linear optics quantum computing

My Publications

Scalable reconstruction of unitary processes and Hamiltonians
M. Holzäpfel, T. Baumgratz, M. Cramer, M.B. Plenio
Phys. Rev. A 91, 042129 (2015)

My Publicationns and preprints on the arXiv