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Entanglement dynamics of coupled qubits and a semi-decoherence free subspace |
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| Authors: | Gabriele Campagnano Ulrich Weiss |
| Institution: | a II Institut für Theoretische Physik, Universität Stuttgart, Germany b Perimeter Institute for Theoretical Physics, 31 Caroline St. N, N2L 2Y5, Waterloo ON, Canada c Massachusetts Institute of Technology, Research Laboratory of Electronics, 77 Massachusetts Ave., Cambridge, MA 02139, United States |
| Abstract: | We study the entanglement dynamics and relaxation properties of a system of two interacting qubits in the cases of (I) two independent bosonic baths and (II) one common bath. We find that in the case (II) the existence of a decoherence-free subspace (DFS) makes entanglement dynamics very rich. We show that when the system is initially in a state with a component in the DFS the relaxation time is surprisingly long, showing the existence of semi-decoherence free subspaces. |
| Keywords: | 03 65 Yz 03 67 -a 03 67 Mn 42 50 Lc |
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