Exact Results on Dynamical Decoupling by $\pi$-Pulses in Quantum Information Processes

Understand

The aim of dynamical decoupling consists in the suppression of decoherence by appropriate coherent control of a quantum register.

• Effectively, the interaction with the environment is reduced.
• In particular, a sequence of $\pi$ pulses is considered.
• Here we present exact results on the suppression of the coupling of a quantum bit to its environment by optimized sequences of $\pi$ pulses.