Quantum-state transfer in spin chains via isolated resonance of terminal spins

Kamil Korzekwa, Paweł Machnikowski, and Paweł Horodecki
Phys. Rev. A 89, 062301 – Published 3 June 2014

Abstract

We propose a quantum-state transfer protocol in a spin chain that requires only the control of the spins at the ends of the quantum wire. The protocol is to a large extent insensitive to inhomogeneity caused by local magnetic fields and perturbation of exchange couplings. Moreover, apart from the free evolution regime, it allows one to induce an adiabatic spin transfer, which provides the possibility of performing the transfer on demand. We also show that the amount of information leaking into the central part of the chain is small throughout the whole transfer process (which protects the information sent from being eavesdropped) and can be controlled by the magnitude of the external magnetic field.

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  • Received 28 March 2014

DOI:https://doi.org/10.1103/PhysRevA.89.062301

©2014 American Physical Society

Authors & Affiliations

Kamil Korzekwa1,2, Paweł Machnikowski2, and Paweł Horodecki3,4

  • 1Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom
  • 2Institute of Physics, Wrocław University of Technology, 50-370 Wrocław, Poland
  • 3Faculty of Applied Physics and Mathematics, Technical University of Gdańsk, PL-80-952 Gdańsk, Poland
  • 4National Quantum Information Centre of Gdańsk, PL-81-824 Sopot, Poland

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Issue

Vol. 89, Iss. 6 — June 2014

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