Control of decoherence: analysis and comparison of three different strategies

Details Control of decoherence: analysis and comparison of three different strategies Control of decoherence: analysis and comparison of three different strategies

2004-03-29

arxiv.org/abs/quant-ph/0403205v1

Phys. Rev. A 71 (2005) 022302

Physics

Quantum Physics

30 pages, 13 figures

Scientific paper

10.1103/PhysRevA.71.022302

We analyze and compare three different strategies, all aimed at controlling and eventually halting decoherence. The first strategy hinges upon the quantum Zeno effect, the second makes use of frequent unitary interruptions ("bang-bang" pulses and their generalization, quantum dynamical decoupling), and the third of a strong, continuous coupling. Decoherence is shown to be suppressed only if the frequency N of the measurements/pulses is large enough or if the coupling K is sufficiently strong. Otherwise, if N or K are large, but not extremely large, all these control procedures accelerate decoherence. We investigate the problem in a general setting and then consider some practical examples, relevant for quantum computation.

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