Randomized Dynamical Decoupling Techniques for Coherent Quantum Control

Details Randomized Dynamical Decoupling Techniques for Coherent Quantum Control Randomized Dynamical Decoupling Techniques for Coherent Quantum Control

2006-02-21

arxiv.org/abs/quant-ph/0602175v2

Physics

Quantum Physics

7 pages, 2 figures. Replaced with final version. Invited talk delivered at the XXXVI Winter Colloquium on the Physics of Quant

Scientific paper

10.1080/09500340600955633

The need for strategies able to accurately manipulate quantum dynamics is ubiquitous in quantum control and quantum information processing. We investigate two scenarios where randomized dynamical decoupling techniques become more advantageous with respect to standard deterministic methods in switching off unwanted dynamical evolution in a closed quantum system: when dealing with decoupling cycles which involve a large number of control actions and/or when seeking long-time quantum information storage. Highly effective hybrid decoupling schemes, which combine deterministic and stochastic features are discussed, as well as the benefits of sequentially implementing a concatenated method, applied at short times, followed by a hybrid protocol, employed at longer times. A quantum register consisting of a chain of spin-1/2 particles interacting via the Heisenberg interaction is used as a model for the analysis throughout.

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