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Spin Chains as Data Buses, Logic Buses and Entanglers

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Quantum State Transfer and Network Engineering

Part of the book series: Quantum Science and Technology ((QST))

Abstract

In this contribution, we describe some uses of the nonequilibrium dynamics of a spin chain in connecting remote registers for scalable quantum information processing. We first present a brief motivation, and a basic scheme to illustrate the idea of quantum state transfer through a spin chain. This is followed by an outline survey (by no means exhaustive) of the progress to date. We then describe one of the recently proposed methods which provides a high fidelity state transfer with minimal engineering, encoding and control. Next we present a couple of protocols for using nonequilibrium dynamics induced by quenches for establishing entanglement between well separated spins – these use the natural entanglement in a canonical condensed matter system, namely the Kondo system, but convert it to a useful form through the dynamics. Finally the possibility of usage of spin chains for quantum logic between remote registers is discussed along with a specific application to atomic systems.

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Acknowledgements

SB acknowledges the support of an ERC grant. Much of the reviewed work was supported, when it was done, by the EPSRC, the Royal Society and the Wolfson Foundation. LB and PV want to thank their collaborators in the work reported, namely, Tony John George Apollaro, Alessandro Cuccoli and Ruggero Vaia. PS thanks CNPq (Brazil) and the EC Seventh Framework Programme (FP7/2007–2013) under grant 295234-FP7-PEOPLE-2011-IRSES (project QICFT) for financial support. P.V. acknowledges financial support from the Consiglio Nazionale delle Ricerche, in the framework of the Short Term Mobility Program 2010.

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Authors and Affiliations

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

    Sougato Bose & Abolfazl Bayat

  2. International Institute of Physics, Federal University of Rio Grande do Norte, A. Odilon Gomes de Lima 1722, Capim Macio, Natal, RN, 59078-400, Brazil

    Pasquale Sodano

  3. INFN, Sezione di Perugia, Via A. Pascoli, 06123, Perugia, Italy

    Pasquale Sodano

  4. ISI Foundation, Via Alassio 11/c, I-10126, Torino (TO), Italy

    Leonardo Banchi

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

    Leonardo Banchi & Paola Verrucchi

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

    Leonardo Banchi & Paola Verrucchi

  7. Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, via Madonna del Piano 10, I-50019, Sesto Fiorentino (FI), Italy

    Paola Verrucchi

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  1. Sougato Bose
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  2. Abolfazl Bayat
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  4. Leonardo Banchi
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  5. Paola Verrucchi
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Correspondence to Sougato Bose .

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Editors and Affiliations

  1. Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, Heraklion, Greece

    Georgios M. Nikolopoulos

  2. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University Department of Physics, Prague, Czech Republic

    Igor Jex

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Bose, S., Bayat, A., Sodano, P., Banchi, L., Verrucchi, P. (2014). Spin Chains as Data Buses, Logic Buses and Entanglers. In: Nikolopoulos, G., Jex, I. (eds) Quantum State Transfer and Network Engineering. Quantum Science and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-39937-4_1

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  • DOI: https://doi.org/10.1007/978-3-642-39937-4_1

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