Keeping a Quantum Bit Alive by Optimized $\pi$-Pulse Sequences

Abstract

A general strategy to maintain the coherence of a quantum bit is proposed. The analytical result is derived rigorously including all memory and back-action effects. It is based on an optimized $\pi$-pulse sequence for dynamic decoupling extending the Carr-Purcell-Meiboom-Gill (CPMG) cycle. The optimized sequence is very efficient, in particular for strong couplings to the environment.

4 pages, 2 figures; revised version with additional references for better context, more stringent discussion

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