In a computer or communication device, information is embodied in some physical system; the capabilities of such an information processing device are derived from its physical properties. It is known that if the device is quantum mechanical, i.e., it exploits the physical laws of quantum mechanics, then its capabilities can exceed those of classical devices. Taking a theoretical physics approach, our group investigates solid-state systems for quantum information processing. In particular, we investigate single electron spin dynamics and coherence in semiconductor and carbon nanostructores (quantum dots, quantum wires, etc.) as well as superconducting qubits. Further research areas include light-matter interactions between solid-state qubits and photons, optical cavities and the use of cavity quantum electrodynamics for quantum information processing, and the production, dynamics, and characterization of entanglement in solid-state systems. We are also working on the theory of quantum computation and quantum information. (read more) (deutsch)

  Hear theoretical physicists John Preskill and Spiros Michalakis
  describe quantum computing on YouTube.
  (illustrated by Jorge Cham of PhD Comics)

  Guido.Burkard@uni-konstanz.de, Department of Physics (personal details, contact details)

  research highlights

cavity QED with RX qubits
  Resonantly driven CNOT gate for electron spins
  D.M. Zajac, AJ. Sigillito, M. Russ, F. Borjans, J.M. Taylor, G. Burkard, J.R. Petta
  Science 07 Dec 2017 (10.1126/science.aao5965) (2017)

  University of Konstanz News Release [English / Deutsch]

cavity QED with RX qubits
  Accelerated quantum control using superadiabatic dynamics in a solid-state lambda system
  B.B. Zhou, A. Baksic, H. Ribeiro, C.G. Yale, J.F. Heremans, P.C. Jerger, A. Auer, G. Burkard, A.A. Clerk, D.D. Awschalom
  Nature Physics 13, 330 (2017)

  University of Konstanz News Release [English / Deutsch]

sub-cycle QED
  Subcycle Quantum Electrodynamics
  C. Riek, P. Sulzer, M. Seeger, A.S. Moskalenko, G. Burkard, D.V. Seletskiy, A. Leitenstorfer
  Nature 541, 376 (2017)

cavity QED with RX qubits

  Creating arbitrary quantum vibrational states in a carbon nanotube
  H. Wang and G. Burkard
  Phys. Rev. B 94, 205413 (2016) (highlighted as an Editor's suggestion, see editorial Synopsis in Physics)

NV Berry phase   Optical manipulation of the Berry phase in a solid-state spin qubit
  C. G. Yale, F. J. Heremans, B. B. Zhou, A. Auer, G. Burkard, D. D. Awschalom
  Nature Photonics 10, 184 (2016)

  News and Views article: L. Rogers and F. Jelezko, Nature Photonics 10, 147 (2016)
  University of Konstanz News Release [deutsch / in German]
  University of Chicago News Release

cavity QED with RX qubits

  Long distance coupling of resonant exchange qubits
  M. Russ and G. Burkard
  Phys. Rev. B 92, 205412 (2015) (highlighted as an Editor's suggestion)

electro-optic sampling of vacuum fluctuations   Direct sampling of electric-field vacuum fluctuations
  C. Riek, D. V. Seletskiy, A. S. Moskalenko, J. F. Schmidt, P. Krauspe, S. Eckart, S. Eggert, G. Burkard, A. Leitenstorfer
  Science 350, 420 (2015) [free access to article via this site]

  Paraxial Theory of Direct Electro-optic Sampling of the Quantum Vacuum
  A. S. Moskalenko, C. Riek, D. Seletskiy, G. Burkard, A. Leitenstorfer
  Phys. Rev. Lett. 115, 263601 (2015)