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Transmitting bipartite and multipartite correlations via spin chains under phase decoherence. (English) Zbl 1263.81068

Summary: We investigate the transfer of bipartite (measured by cocurrence) and multipartite (measured by global discord) quantum correlations though spin chains under phase decoherence. The influence of phase decoherence and anisotropy parameter upon quantum correlations transfer is investigated. On the one hand, in the case of no phase decoherence, there is no steady state quantum correlations between spins. On the other hand, if the phase decoherence is larger than zero, the bipartite quantum correlations can be transferred through a Heisenberg XXX chain for a long time and there is steady state bipartite entanglement. For a Heisenberg XX chain, bipartite entanglement between two spins is destroyed completely after a long time. Multipartite quantum correlations of all spins are more robust than bipartite quantum correlations. Thus, one can store multipartite quantum correlations in spin chains for a long time under phase decoherence.

MSC:

81P45 Quantum information, communication, networks (quantum-theoretic aspects)
82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs arising in equilibrium statistical mechanics
81S22 Open systems, reduced dynamics, master equations, decoherence
81P40 Quantum coherence, entanglement, quantum correlations
94A40 Channel models (including quantum) in information and communication theory
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References:

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