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Quantum Markovian Subsystems: Invariance, Attractivity, and Control

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2 Author(s)
Ticozzi, F. ; Dipt. di Ing. dell''Inf., Univ. di Padova, Padova ; Viola, L.

We characterize the dynamical behavior of continuous-time, Markovian quantum systems with respect to a subsystem of interest. Markovian dynamics describes a wide class of open quantum systems of relevance to quantum information processing, subsystem encodings offering a general pathway to faithfully represent quantum information. We provide explicit linear-algebraic characterizations of the notion of invariant and noiseless subsystem for Markovian master equations, under different robustness assumptions for model-parameter and initial-state variations. The stronger concept of an attractive quantum subsystem is introduced, and sufficient existence conditions are identified based on Lyapunov's stability techniques. As a main control application, we address the potential of output-feedback Markovian control strategies for quantum pure state-stabilization and noiseless-subspace generation. In particular, explicit results for the synthesis of stabilizing semigroups and noiseless subspaces in finite-dimensional Markovian systems are obtained.

Published in:

Automatic Control, IEEE Transactions on  (Volume:53 ,  Issue: 9 )

Date of Publication:

Oct. 2008

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