Quantum Institute: Visitor Schedule

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.
For more information, contact Diego Dalvit.

Thursday, April 8, 2008
12:30 PM to 2 PM

Speaker: Viatcheslav Dobrovitski, Iowa State University, Ames Laboratory

Technical Host: Khaled Alhassanieh, T-11

TOPIC: Decoherence and control of single central spins in solid state systems

Abstract
Understanding decoherence of quantum spin systems coupled to a bath of environmental spins (spin bath) is important for many areas of physics, such as spintronics, quantum computing, nuclear and electronic magnetic resonance. We have developed highly efficient and accurate numerical techniques for studying decoherence in quantum many-spin systems, including novel approaches based on techniques borrowed from quantum optics. We used these techniques to model several experimentally important situations: decoherence of an electron spin by a bath of nuclear spins in a quantum dot, which demonstrates interesting decoherence regime; decoherence and decay of Rabi oscillations in dipolar-coupled systems, such as NV centers in diamond; and modeling of NMR experiments with thousands of spins involved in the decoherence process.