Berlin 2012 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HL: Fachverband Halbleiterphysik
HL 18: Transport: Quantum Coherence and Quantum Information Systems 2 (jointly with TT, MA)
HL 18.6: Talk
Monday, March 26, 2012, 16:30–16:45, BH 243
Decoherence of a qubit in a non-Markovian environment formed through a spin cluster — •Wenling Qiao1,2, Mohammad Ansari2, and Frank Wilhelm-Mauch1,2 — 1Saarland University, Saarbrücken, Germany — 2University of Waterloo, Waterloo, Canada
The error rate in quantum computing based on solid-state devices is mostly limited by the qubit decoherence behavior. While Markovian environments are well understood, the main experimental and theoretical challanges lie in the field of correlated non-Markovian noises. We study the quantum dynamics of a qubit in a toy non-Markovian environment model, a large spin cluster coupled to a thermal bath. By using the Holstein-Primokoff transformation,Bogoliubov transformation on the spin Hamiltonian and representing the master equation in phase space, we calculated the correlation function for the spin operator coupled to the qubit. This permits insight into the decoherence of the qubit.