# 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**

** 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)

**Semiclassical spectral function for matter waves in random potentials **

Martin Trappe, Dominique Delande, and Cord A. Müller

J. Phys. A: Math. Theor. **48**, 245102 (2015)

selected for the Publisher's
Pick accompanied by an interview

**k.p theory for two-dimensional transition metal dichalcogenide semiconductors**

A. Kormányos, G. Burkard, M. Gmitra, J. Fabian, V. Zólyomi, N. D. Drummond, and V. Fal'ko

2D Mater. **2**, 022001 (2015)

**Hybrid Spin and Valley Quantum Computing with Singlet-Triplet Qubits**

Niklas Rohling, Maximilian Russ, and Guido Burkard

Phys. Rev. Lett. **113**, 176801 (2014)

**Ultrafast optical control of orbital and spin dynamics in a solid-state defect**

L. C. Bassett, F. J. Heremans, D. J. Christle, C. G. Yale, G. Burkard, B. B. Buckley, and D. D. Awschalom

Science **345**, 1333 (2014)

Perspectives Article: L. Childress, Science **345**, 1247 (2014)

**Spin-Orbit Coupling, Quantum Dots, and Qubits in
Monolayer Transition Metal Dichalcogenides**

A. Kormányos, V. Zólyomi, N.D. Drummond, G. Burkard

Phys. Rev. X 4, 011034 (2014)

## New Publications

- Long-range photon-mediated gate scheme between nuclear spin qubits in diamond
- Spintronics with graphene quantum dots
- Finite-size effects on the minimal conductivity in graphene with Rashba spin-orbit coupling
- Magnetic field oscillations of the critical current in long ballistic graphene Josephson junctions
- Speckle-intensity correlations of photons scattered by cold atoms
- Paraxial Theory of Direct Electro-optic Sampling of the Quantum Vacuum