Keeping a Quantum Bit Alive by Optimized $π$-Pulse Sequences

Details Keeping a Quantum Bit Alive by Optimized $π$-Pulse Sequences Keeping a Quantum Bit Alive by Optimized $π$-Pulse Sequences

2006-09-26

arxiv.org/abs/quant-ph/0609203v2

PRL 98, 100504 (2007)

Physics

Quantum Physics

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

Scientific paper

10.1103/PhysRevLett.98.100504

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.

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