Stochastic resonance phenomena in spin chains |
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Authors: | A Rivas N P Oxtoby and S F Huelga |
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Institution: | (1) Quantum Physics Group, STRI, Department of Physics, Astronomy and Mathematics, University of Hertfordshire, Herts AL10 9AB, Hatfield, UK |
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Abstract: | We discuss stochastic resonance-like effects in the
context of coupled quantum spin systems. We focus here on an
information-theoretic approach and analyze the steady state quantum
correlations (entanglement) as well as the global correlations in
the system when subject to different forms of local decoherence. In
the presence of decay, it has been shown that the system displays
quantum correlations only when the noise strength is above a certain
threshold. We extend this result to the case of a Heisenberg
XYZ exchange interaction and revise and clarify the mechanisms
underlying this behaviour. In the presence of pure dephasing, we
show that the system always remains separable in the steady state.
When both types of noise are present, we show that the system can
still exhibit entanglement for long times, provided that the pure
dephasing rate is not too large. |
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Keywords: | PACS" target="_blank">PACS 03 65 Yz Decoherence open systems quantum statistical methods 03 67 Bg Entanglement production and manipulation |
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