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Ballistic quantum state transfer in spin chains: General theory for quasi-free models and arbitrary initial states

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Abstract

Ballistic quantum information transfer through spin chains is based on the idea of making the spin dynamics ruled by collective excitations with linear dispersion relation. Unlike perfect state transfer schemes, a ballistic transmission requires only a minimal engineering of the interactions; in fact, for most practical purposes, the optimization of the couplings to the ends of the chain is sufficient to obtain an almost perfect transmission. In this work we review different ballistic quantum state transfer protocols based on the dynamics of quasi-free spin chains, and further generalize them both at zero and finite temperature. In particular, besides presenting novel analytical results for XX, XY, and Ising spin models, it is shown how, via a complete control on the first and last two qubits of the chain, destructive thermal effects can be cancelled, leading to a high-quality state transmission irrespective of the temperature.

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Authors and Affiliations

  1. Department of Physics and Astronomy, University College London, Gower St., WC1E 6BT, London, UK

    Leonardo Banchi

  2. Dipartimento di Fisica, Università di Firenze, Via G. Sansone 1, I-50019, Sesto Fiorentino (FI), Italy

    Leonardo Banchi

  3. INFN, Sezione di Firenze, via G.Sansone 1, I-50019, Sesto Fiorentino (FI), Italy

    Leonardo Banchi

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Banchi, L. Ballistic quantum state transfer in spin chains: General theory for quasi-free models and arbitrary initial states. Eur. Phys. J. Plus 128, 137 (2013). https://doi.org/10.1140/epjp/i2013-13137-6

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