# Overview

*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)

**Contact**

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

**research highlights**

** Creating arbitrary quantum vibrational states in a carbon nanotube**

H. Wang and G. Burkard

Phys. Rev. B **94**, 205413 (2015)
(highlighted as an Editor's suggestion, see editorial Synopsis in Physics)

** 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

** Long distance coupling of resonant exchange qubits**

M. Russ and G. Burkard

Phys. Rev. B **92**, 205412 (2015)
(highlighted as an Editor's suggestion)

**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)

## New Publications

- Transfer matrix approach for the Kerr and Faraday rotation in layered nanostructures
- Entanglement distillation using the exchange interaction
- Leading gradient correction to the kinetic energy for two-dimensional fermion gases
- Few-second-long correlation times in a quantum dot nuclear spin bath probed by frequency-comb nuclear magnetic resonance spectroscopy
- Creating arbitrary quantum vibrational states in a carbon nanotube
- Optimizing electrically controlled echo sequences for the exchange-only qubit