NMR Quantum Simulation of Localization Effects Induced by Decoherence | Phys. Rev. Lett. 104, 230403 (2010)
NMR Quantum Simulation of Localization Effects Induced by Decoherence
Gonzalo A. Álvarez* and Dieter Suter†
Fakultät Physik, Universität Dortmund, Otto-Hahn-Strasse 4, D-44221 Dortmund, Germany
Received 21 January 2010; published 9 June 2010
The loss of coherence in quantum mechanical superposition states limits the time for which quantum information remains useful. Similarly, it limits the distance over which quantum information can be transmitted. Here, we investigate in a nuclear spin-based quantum simulator, the localization of the size of spin clusters that are generated by a Hamiltonian driving the transmission of information, while a variable-strength perturbation counteracts the spreading. We find that the system reaches a dynamic equilibrium size, which decreases with the square of the perturbation strength.
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