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AIP conference proceedings

Incoherently generated coherences

Raisa I. Karasik, Karl-Peter Marzlin, Barry C. Sanders, K. Birgitta Whaley, Alexander I. Lvovsky

Published Jan 1, 2009• 0 citations
Publisher

Abstract

We have discovered that, in specific cases, decoherence due to the interaction with the environment can be avoided by just introducing a special driving field for an open quantum system. We show that this phenomenon constitutes a new class of decoherence-free subspaces which are useful for passive preservation of quantum information and discuss a physical example.

DOI
10.1063/1.3131343

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We have discovered that, in specific cases, decoherence due to the interaction with the environment can be avoided by just introducing a special driving field for an open quantum system. We show that this phenomenon constitutes a new class of decoherence-free subspaces which are useful for passive preservation of quantum information and discuss a physical example.
Preservation of coherence is a fundamental, yet subtle, phenomenon in open systems.We uncover its relation to symmetries respected by the system Hamiltonian and its coupling to the environment.We discriminate between local and global classes of decoherence-free subspaces for many-body systems through the introduction of "ghost variables".The latter are orthogonal to the symmetry and the coupling to the environment depends solely on them.Constructing them is facilitated in classical phase space and can be transferred to quantum mechanics through the equivalent role that Poisson and Lie algebras play for symmetries in classical and quantum mechanics, respectively.Examples are given for an interacting spin system.