Dr. Karl-Friedrich Wulschner

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Assignments
  • Alumnus/Alumna: Quantum Systems
  • Alumnus/Alumna: Thin Film Technology

 

Karl-Friedrich Wulschner was member of the Gross group at WMI as a Master and Ph.D. student between 2010 and 2016.

Master Thesis: Nb/AlOx/Nb Josephson-Kontakte für supraleitende Quantenschaltkreise (2011)
Ph.D. Thesis: Controlled Interactions in Superconducting Quantum Circuits (2016)

Karl-Friedrich Wulschner was working on the fabrication of superconducting quantum circuits and the realization of a controlled coupling in circuit QED systems. He realized the electrical design and measurements of transmon type qubits, which were coupled to superconducting resonators. Furthermore, he investigated the controllable coupling of superconducting microwave resonators via an rf SQUID. Finally, he analyzed the interaction and entanglement of a microwave resonator with a nano-mechanical beam via an rf SQUID. 

He left WMI in March 2016 to join the Aspelmeyer group at the Faculty of Physics, University of Vienna, as a postdoctoral researcher.

 

Publications of Dr. Karl-Friedrich Wulschner

2018

Ultrawide-range photon number calibration using a hybrid system combining nano-electromechanics and superconducting circuit quantum electrodynamics
Research Article | Appl. Phys. Lett. 113, 152601  (2018)
Philip Schmidt, Daniel Schwienbacher, Matthias Pernpeintner, Friedrich Wulschner, Frank Deppe, Achim Marx, Rudolf Gross, Hans Huebl

2017

Hysteretic Flux Response and Nondegenerate Gain of Flux-Driven Josephson Parametric Amplifiers
Research Article | Physical Review Applied 8, 024012  (2017)
Stefan Pogorzalek, Kirill G. Fedorov, Ling Zhong, Jan Goetz, Friedrich Wulschner, Michael Fischer, Peter Eder, Edwar Xie, Kunihiro Inomata, Tsuyoshi Yamamoto, Yasunobu Nakamura, Achim Marx, Frank Deppe, Rudolf Gross
Photon Statistics of Propagating Thermal Microwaves
Research Article | Physical Review Letters 118, 103602  (2017)
J. Goetz, S. Pogorzalek, F. Deppe, K. G. Fedorov, P. Eder, M. Fischer, F. Wulschner, E. Xie, A. Marx, R. Gross
Second-order decoherence mechanisms of a transmon qubit probed with thermal microwave states
Research Article | Quantum Sci. Technol. 2, 025002  (2017)
J. Goetz, F. Deppe, P. Eder, M. Fischer, M. Müting, J. P. Martínez, S. Pogorzalek, F. Wulschner, E. Xie, K. G. Fedorov, A. Marx, R. Gross

2016

Controlled Interactions in Superconducting Quantum Circuits
PHD Thesis | Technical University of Munich  (2016)
Karl Friedrich Wulschner
Displacement of propagating squeezed microwave states
Research Article | Physical Review Letters 117, 020502  (2016)
Kirill G. Fedorov, L. Zhong, S. Pogorzalek, P. Eder, M. Fischer, J. Goetz, E. Xie, F. Wulschner, K. Inomata, T. Yamamoto, Y. Nakamura, R. Di Candia, U. Las Heras, M. Sanz, E. Solano, E. P. Menzel, F. Deppe, A. Marx, R. Gross
Loss mechanisms in superconducting thin film microwave resonators
Research Article | Journal of Applied Physics 119, 015304  (2016)
J. Goetz, F. Deppe, M. Haeberlein, F. Wulschner, C. W. Zollitsch, S. Meier, M. Fischer, P. Eder, E. Xie, K. G. Fedorov, E. P. Menzel, A. Marx, and R. Gross
Tunable coupling of transmission-line microwave resonators mediated by an rf SQUID
Research Article | EPJ Quantum Technology 3, 10  (2016)
F. Wulschner, J. Goetz, F. R. Koessel, E. Hoffmann, A. Baust, P. Eder, M. Fischer, M. Haeberlein, M. J. Schwarz, M. Pernpeintner, E. Xie, L. Zhong, C. W. Zollitsch, B. Peropadre, J.-J. Garcia Ripoll, E. Solano, K. Fedorov, E. P. Menzel, F. Deppe, A. Marx, R. Gross
Ultrastrong coupling in two-resonator circuit QED
Research Article | Physical Review B 93, 214501  (2016)
A. Baust, E. Hoffmann, M. Haeberlein, M. J. Schwarz, P. Eder, J. Goetz, F. Wulschner, E. Xie, L. Zhong, F. Quijandria, D. Zueco, J.-J. Garcia Ripoll, L. Garcia-Alvarez, G. Romero, E. Solano, K. G. Fedorov, E. P. Menzel, F. Deppe, A. Marx, R. Gross

2015

Spin-boson model with an engineered reservoir in circuit quantum electrodynamics
Research Article | arXiv:1506.09114
Max Haeberlein, Frank Deppe, Andreas Kurcz, Jan Goetz, Alexander Baust, Peter Eder, Kirill Fedorov, Michael Fischer, Edwin P. Menzel, Manuel J. Schwarz, Friedrich Wulschner, Edwar Xie, Ling Zhong, Enrique Solano, Achim Marx, Juan-José García-Ripoll, Rudolf Gross
Tunable and Switchable Coupling Between Two Superconducting Resonators
Research Article | Physical Review B 91, 014515  (2015)
A. Baust, E. Hoffmann, M. Haeberlein, M. J. Schwarz, P. Eder, E. P. Menzel, K. Fedorov, J. Goetz, F. Wulschner, E. Xie, L. Zhong, F. Quijandria, B. Peropadre, D. Zueco, J.-J. Garcia Ripoll, E. Solano, F. Deppe, A. Marx, R. Gross

2013

Tunable coupling engineering between superconducting resonators: from sidebands to effective gauge fields
Research Article | Physical Review B 87, 134504  (2013)
B. Peropadre, D. Zueco, F. Wulschner, F. Deppe, A. Marx, R. Gross, J.J. García-Ripoll

2011

Nb/AlOx/Nb Josephson-Kontakte für supraleitende Quantenschaltkreise
Master Thesis | Technical University of Munich  (2011)
Karl Friedrich Wulschner
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