Abstract
Many-spin entanglement is investigated in one-dimensional zigzag chains, consisting of up to 12 spins 1/2, with nearest neighbor and next nearest neighbor interactions at high and low temperatures. We consider multiple quantum (MQ) nuclear magnetic resonance (NMR) dynamics. The second moment of the distribution of MQ coherences, which provides a lower bound on the quantum Fisher information, is calculated for different temperatures and evolution times. The dependence of the number of the entangled spins on the temperature and the chain length is obtained.
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Funding
This work was performed as a part of a state task, State Registration no. 0089-2019-0002. This work was supported by the Russian Foundation for Basic Research, Grant no. 20-03-00147. I.L. acknowledges support from the Foundation for the Advancement of Theoretical Physics and Mathematics BASIS no. 19-1-5-130-1.
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Bochkin, G.A., Vasil’ev, S.G., Doronin, S.I. et al. Many-Spin Entanglement in Zigzag Spin Chain in Multiple Quantum NMR. Appl Magn Reson 51, 667–678 (2020). https://doi.org/10.1007/s00723-020-01206-0
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DOI: https://doi.org/10.1007/s00723-020-01206-0