Document Type
Article
Publication Date
11-17-2006
Publication Title
Physical Review A - Atomic, Molecular, and Optical Physics
Department
Department of Physics and Astronomy
Abstract
Synthesizing an effective identity evolution in a target system subjected to unwanted unitary or nonunitary dynamics is a fundamental task for both quantum control and quantum information processing applications. Here, we investigate how single-bit, discrete-time feedback capabilities may be exploited to enact or to enhance quantum procedures for effectively suppressing unwanted dynamics in a finite-dimensional open quantum system. An explicit characterization of the joint unitary propagators correctable by a single-bit feedback strategy for arbitrary evolution time is obtained. For a two-dimensional target system, we show how by appropriately combining quantum feedback with dynamical decoupling methods, concatenated feedback-decoupling schemes may be built, which can operate under relaxed control assumptions and can outperform purely closed-loop and open-loop protocols.
DOI
10.1103/PhysRevA.74.052328
Dartmouth Digital Commons Citation
Ticozzi, Francesco and Viola, Lorenza, "Single-Bit Feedback and Quantum-Dynamical Decoupling" (2006). Dartmouth Scholarship. 3200.
https://digitalcommons.dartmouth.edu/facoa/3200
