Driving quantum systems into decoherence-free subspaces by Lyapunov control

X. X. Yi, X. L. Huang, Chunfeng Wu, and C. H. Oh
Phys. Rev. A 80, 052316 – Published 12 November 2009

Abstract

We present a scheme to drive a finite-dimensional quantum system into the decoherence-free subspaces (DFS) by Lyapunov control. Control fields are established by Lyapunov function. This proposal works well for both closed and open quantum systems, with replacing the DFS by desired subspaces for closed systems. An example which consists of a four-level system with three degenerate states driven by three lasers is presented to gain further insight on the scheme. Numerical simulations for the dynamics of the system are performed and the results are good.

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  • Received 12 August 2009

DOI:https://doi.org/10.1103/PhysRevA.80.052316

©2009 American Physical Society

Authors & Affiliations

X. X. Yi1,2, X. L. Huang1, Chunfeng Wu2, and C. H. Oh2

  • 1School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
  • 2Centre for Quantum Technologies and Department of Physics, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore

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Issue

Vol. 80, Iss. 5 — November 2009

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